broken descriptions in foundry v12

[Licenser]

Describe the bug

All long descriptions are only showing as [object Promise] in v12 Foundry

To Reproduce
Steps to reproduce the behavior:

1. create a character
2. Click on 'Extras' (or stunts)
3. Go to edit mode
4. See the Description be reduced to [object Promise]
5. edit the description
6. save the description
7. See the Description be reduced to [object Promise] again

Expected behavior
Description texts are correctly displayed and can be edited

Screenshots or Videos

Desktop (please complete the following information):

• Browser Chrome based & firefox

Additional context

The error console shows no errors just the following warning:

Error: You are accessing globalThis.duplicate which must now be accessed via foundry.utils.duplicate
Deprecated since Version 12
Backwards-compatible support will be removed in Version 14
    at Object.logCompatibilityWarning (foundry-esm.js:4598:19)
    at get (foundry-esm.js:65057:25)
    at CharacterSheet.getData (system.js:2:106817)
    at CharacterSheet._render (foundry.js:5814:29)
    at CharacterSheet._render (foundry.js:6548:17)
    at CharacterSheet._render (foundry.js:7134:17)
    at CharacterSheet._render (system.js:2:108834)
    at CharacterSheet.render (foundry.js:5769:10)
    at FateActor.render (foundry.js:10745:13)
    at FateActor.render (system.js:2:154407)
    at FateActor._onUpdateDescendantDocuments (foundry.js:11113:12)
    at FateActor._onUpdateDescendantDocuments (foundry.js:15962:11)
    at FateActor._dispatchDescendantDocumentEvents (foundry.js:11033:10)
    at #handleUpdateDocuments (foundry-esm.js:55792:15)
    at async FateItem.updateDocuments (foundry-esm.js:11384:23)
    at async FateItem.update (foundry-esm.js:11494:23)
    at async StuntSheet._onSubmit (foundry.js:6641:7)
    at async StuntSheet.saveEditor (foundry.js:6785:5)

[RinVindor]

Also seeing the same bug. Hopefully the system can be updated for v12 as myself and our group want to use the new features.

[PatrickBauer]

Thank you, I'll have a look at this, but can't make any promises right now 🙏