Creator sees moderator as a regular user after rejoining chat

[AntonMedviediev]

User1 is creator of the chat. Admin role initially.
User2 & User 3 are participants. Default role initially.

Description
Incorrect behaviour with the chat rights. Creator see user with moderator rights as a regular user in case of leaving/rejoining chat withour page reload. Also reprodusable on the Element app.

Steps to reproduce:

• 1. Create group chat from User1 with some name.
• 2. Send requests to User2 & User3.
• 3. Accepts from User2 side.
• 4. User1 assign Moderator right to User2.
• 5. User1 leaves the chat and does not reload the page.
• 6. User2 invites back User1.
• 7. User1 accepts invitation.
• 8. User1 see User2 as a regular user with powerLevel 0.
• 9. User2 still see himself as a Moderator with powerLevel 50.
• 10. User1 reloads the page and see User2 as a Moderator as well.

[richvdh]

This sounds like it's probably a server-side issue? Have you checked the events coming down /sync?

[AntonMedviediev]

This sounds like it's probably a server-side issue? Have you checked the events coming down /sync?

@richvdh on what stuff should I exactly look there?
Request about powerlevel update is in place, on 'sync' should I see something related about powerlevel update as well?

[richvdh]

My mistake; can confirm it's a client-side issue.

I reproduced it. On rejoin, user 1 received the following sync response:

{
    "!FqyBUTxYXmnzHlgDGt:xps9320.sw1v.org": {
        "timeline": {
            "events": [
                {
                    "type": "m.room.history_visibility",
                    "sender": "@a:xps9320.sw1v.org",
                    "content": {
                        "history_visibility": "shared"
                    },
                    "state_key": "",
                    "origin_server_ts": 1732541998985,
                    "unsigned": {
                        "membership": "join",
                        "age": 84887
                    },
                    "event_id": "$tZ-K5NAK1jK0Cq3Fo5JJMBCOVOlzi2hNYh_fToYcBNY"
                },
                {
                    "type": "m.room.guest_access",
                    "sender": "@a:xps9320.sw1v.org",
                    "content": {
                        "guest_access": "can_join"
                    },
                    "state_key": "",
                    "origin_server_ts": 1732541998986,
                    "unsigned": {
                        "membership": "join",
                        "age": 84886
                    },
                    "event_id": "$fP_uk42It3BfeKjmPEIqU42Vyarwte2AXgD-V3w3GpY"
                },
                {
                    "type": "m.room.encryption",
                    "sender": "@a:xps9320.sw1v.org",
                    "content": {
                        "algorithm": "m.megolm.v1.aes-sha2"
                    },
                    "state_key": "",
                    "origin_server_ts": 1732541998987,
                    "unsigned": {
                        "membership": "join",
                        "age": 84885
                    },
                    "event_id": "$Xaj_LKCeR1GG27NQr_73xHHfgzEMC8pkXpoPXEhBDtk"
                },
                {
                    "type": "m.room.name",
                    "sender": "@a:xps9320.sw1v.org",
                    "content": {
                        "name": "4528test"
                    },
                    "state_key": "",
                    "origin_server_ts": 1732541998988,
                    "unsigned": {
                        "membership": "join",
                        "age": 84884
                    },
                    "event_id": "$_LUbuj4akGU5lOK6vV3eNk2p8xmWi2TUrSD1THdKZwg"
                },
                {
                    "type": "m.room.member",
                    "sender": "@a:xps9320.sw1v.org",
                    "content": {
                        "displayname": "t",
                        "membership": "invite"
                    },
                    "state_key": "@t:xps9320.sw1v.org",
                    "origin_server_ts": 1732542006781,
                    "unsigned": {
                        "membership": "join",
                        "age": 77091
                    },
                    "event_id": "$NhZLaAuFgfNaLw55uvrMplz3uLZVjbwwwGORVRlZFnY"
                },
                {
                    "type": "m.room.member",
                    "sender": "@t:xps9320.sw1v.org",
                    "content": {
                        "displayname": "t",
                        "membership": "join"
                    },
                    "state_key": "@t:xps9320.sw1v.org",
                    "origin_server_ts": 1732542033895,
                    "unsigned": {
                        "replaces_state": "$NhZLaAuFgfNaLw55uvrMplz3uLZVjbwwwGORVRlZFnY",
                        "prev_content": {
                            "displayname": "t",
                            "membership": "invite"
                        },
                        "prev_sender": "@a:xps9320.sw1v.org",
                        "membership": "join",
                        "age": 49977
                    },
                    "event_id": "$nS3DLK27BeY3Ij3_RopYIiOuI_4TYKpEuIivPiPV3IU"
                },
                {
                    "type": "m.room.power_levels",
                    "sender": "@a:xps9320.sw1v.org",
                    "content": {
                        "users": {
                            "@a:xps9320.sw1v.org": 100,
                            "@t:xps9320.sw1v.org": 50
                        },
                        "users_default": 0,
                        "events": {
                            "m.room.name": 50,
                            "m.room.power_levels": 100,
                            "m.room.history_visibility": 100,
                            "m.room.canonical_alias": 50,
                            "m.room.avatar": 50,
                            "m.room.tombstone": 100,
                            "m.room.server_acl": 100,
                            "m.room.encryption": 100
                        },
                        "events_default": 0,
                        "state_default": 50,
                        "ban": 50,
                        "kick": 50,
                        "redact": 50,
                        "invite": 0,
                        "historical": 100
                    },
                    "state_key": "",
                    "origin_server_ts": 1732542042356,
                    "unsigned": {
                        "replaces_state": "$RovtugkLGtVZoryQZcWg47yd8S7LFQ9raYJTPCSvyVg",
                        "prev_content": {
                            "users": {
                                "@a:xps9320.sw1v.org": 100
                            },
                            "users_default": 0,
                            "events": {
                                "m.room.name": 50,
                                "m.room.power_levels": 100,
                                "m.room.history_visibility": 100,
                                "m.room.canonical_alias": 50,
                                "m.room.avatar": 50,
                                "m.room.tombstone": 100,
                                "m.room.server_acl": 100,
                                "m.room.encryption": 100
                            },
                            "events_default": 0,
                            "state_default": 50,
                            "ban": 50,
                            "kick": 50,
                            "redact": 50,
                            "invite": 0,
                            "historical": 100
                        },
                        "prev_sender": "@a:xps9320.sw1v.org",
                        "membership": "join",
                        "age": 41516
                    },
                    "event_id": "$DT1St7Up-zkK7lUzlI2qi1TerO2Ap_D4E96HwwN4YZM"
                },
                {
                    "type": "m.room.member",
                    "sender": "@a:xps9320.sw1v.org",
                    "content": {
                        "membership": "leave"
                    },
                    "state_key": "@a:xps9320.sw1v.org",
                    "origin_server_ts": 1732542059677,
                    "unsigned": {
                        "replaces_state": "$fKN7aqfnKb3RNepIg8vYDLYMqD0oUa6PxsHNssEAH38",
                        "prev_content": {
                            "displayname": "a",
                            "membership": "join"
                        },
                        "prev_sender": "@a:xps9320.sw1v.org",
                        "membership": "leave",
                        "age": 24195
                    },
                    "event_id": "$a4uakRF_VxR6scBaAoLghSGB3pQJsG-wrTDDQ4cRFD4"
                },
                {
                    "type": "m.room.member",
                    "sender": "@t:xps9320.sw1v.org",
                    "content": {
                        "displayname": "a",
                        "membership": "invite"
                    },
                    "state_key": "@a:xps9320.sw1v.org",
                    "origin_server_ts": 1732542077314,
                    "unsigned": {
                        "replaces_state": "$a4uakRF_VxR6scBaAoLghSGB3pQJsG-wrTDDQ4cRFD4",
                        "prev_content": {
                            "membership": "leave"
                        },
                        "prev_sender": "@a:xps9320.sw1v.org",
                        "membership": "invite",
                        "age": 6558
                    },
                    "event_id": "$8B1VQcS0_i0MmaJfi6Jd1BRBj2gOk1L9LHRAh7cmTCs"
                },
                {
                    "type": "m.room.member",
                    "sender": "@a:xps9320.sw1v.org",
                    "content": {
                        "displayname": "a",
                        "membership": "join"
                    },
                    "state_key": "@a:xps9320.sw1v.org",
                    "origin_server_ts": 1732542083719,
                    "unsigned": {
                        "replaces_state": "$8B1VQcS0_i0MmaJfi6Jd1BRBj2gOk1L9LHRAh7cmTCs",
                        "prev_content": {
                            "displayname": "a",
                            "membership": "invite"
                        },
                        "prev_sender": "@t:xps9320.sw1v.org",
                        "membership": "join",
                        "age": 153
                    },
                    "event_id": "$D5aMM2tDWogmPnHOvYzwA8wTe6Iv8lywSvNrYlcggvc"
                }
            ],
            "prev_batch": "s1116_138958_0_726_2365_1_1623_1804_0_1",
            "limited": true
        },
        "state": {
            "events": [
                {
                    "type": "m.room.member",
                    "sender": "@a:xps9320.sw1v.org",
                    "content": {
                        "displayname": "a",
                        "membership": "join"
                    },
                    "state_key": "@a:xps9320.sw1v.org",
                    "origin_server_ts": 1732541998850,
                    "unsigned": {
                        "age": 85022
                    },
                    "event_id": "$fKN7aqfnKb3RNepIg8vYDLYMqD0oUa6PxsHNssEAH38"
                },
                {
                    "type": "m.room.power_levels",
                    "sender": "@a:xps9320.sw1v.org",
                    "content": {
                        "users": {
                            "@a:xps9320.sw1v.org": 100
                        },
                        "users_default": 0,
                        "events": {
                            "m.room.name": 50,
                            "m.room.power_levels": 100,
                            "m.room.history_visibility": 100,
                            "m.room.canonical_alias": 50,
                            "m.room.avatar": 50,
                            "m.room.tombstone": 100,
                            "m.room.server_acl": 100,
                            "m.room.encryption": 100
                        },
                        "events_default": 0,
                        "state_default": 50,
                        "ban": 50,
                        "kick": 50,
                        "redact": 50,
                        "invite": 0,
                        "historical": 100
                    },
                    "state_key": "",
                    "origin_server_ts": 1732541998944,
                    "unsigned": {
                        "age": 84928
                    },
                    "event_id": "$RovtugkLGtVZoryQZcWg47yd8S7LFQ9raYJTPCSvyVg"
                },
                {
                    "type": "m.room.join_rules",
                    "sender": "@a:xps9320.sw1v.org",
                    "content": {
                        "join_rule": "invite"
                    },
                    "state_key": "",
                    "origin_server_ts": 1732541998984,
                    "unsigned": {
                        "age": 84888
                    },
                    "event_id": "$GQsh6pV0MOgWLsfHTsILlr2-GJeFy3X9__rzGnG9Obo"
                },
                {
                    "type": "m.room.create",
                    "sender": "@a:xps9320.sw1v.org",
                    "content": {
                        "room_version": "10",
                        "creator": "@a:xps9320.sw1v.org"
                    },
                    "state_key": "",
                    "origin_server_ts": 1732541998725,
                    "unsigned": {
                        "age": 85147
                    },
                    "event_id": "$dUEgKbp9lBUwfoLtao-5yYk8z-oTBFrE66iYqdzD14M"
                }
            ]
        },
        "account_data": {
            "events": []
        },
        "ephemeral": {
            "events": []
        },
        "unread_notifications": {
            "notification_count": 0,
            "highlight_count": 0
        },
        "summary": {
            "m.joined_member_count": 2,
            "m.invited_member_count": 0
        }
    }
}

Note the two power_levels events in the response; the later one is (correctly) in timeline.

[richvdh]

Also filed as element-hq/element-web#28536 since it affects Element-web

[t3chguy]

Looks like this issue was well-known by yourself @richvdh 8 years ago :D

https://github.com/matrix-org/matrix-js-sdk/blame/a99c1e96d69277226c197865d71d2f5d4ff2d03d/src/sync.js#L1215-L1220

Affects leave->rejoin due to limited timeline

Found matching logs 2024-11-25T13:41:23.885Z D Already have event $a4uakRF_VxR6scBaAoLghSGB3pQJsG-wrTDDQ4cRFD4 in limited sync - not resetting from the ones you submitted in the EW issue.

Will be fixed by MSC4222 work