[Bug]: German umlauts in file names arent saved in the game World of Warcraft

[pquerner]

Describe the bug

In the game "World of Warcraft" you can name your characters. One of my characters is named with a german umlaut "Ü" / "ü".
When I log in to this character and change something in the settings - it should get saved to a file in a folder which is named after that character (with umlaut).

The bug is, that it doesnt get saved. And I assume its because of the umlaut, since any other character without any special character is acting normally.

I can confirm that atleast the "cmd" shows the umlaut correct, and I even set my language to "German" in the bottles settings.

To Reproduce

Tricky.. I only know about this with World of Warcraft.

I wasnt able to reproduce it without the game.

Package

Flatpak from Flathub

Distribution

EndevourOS (Arch)

Debugging Information

Official Package: true
Version: '51.15'
DE/WM: plasmax11
Display:
    X.org: true
    X.org (port): :0
    Wayland: false
Graphics:
    vendors:
        nvidia:
            vendor: nvidia
            envs:
                __NV_PRIME_RENDER_OFFLOAD: '1'
                __GLX_VENDOR_LIBRARY_NAME: nvidia
                __VK_LAYER_NV_optimus: NVIDIA_only
            icd: /usr/lib/x86_64-linux-gnu/GL/vulkan/icd.d/nvidia_icd.json
            nvngx_path: /usr/lib/x86_64-linux-gnu/GL/nvidia-565-57-01/extra/nvidia/wine
    prime:
        integrated: null
        discrete: null
Kernel:
    Type: Linux
    Version: 6.6.62-1-lts
Disk:
    Total: 33600278528
    Free: 33600094208
RAM:
    MemTotal: 62.6GiB
    MemAvailable: 47.1GiB
Bottles_envs: null

Troubleshooting Logs

No response

Additional context

Screenshot of cmd of the character names (examples) here:

When I create a folder with the umlaut in cmd it gets created correctly, so I suspect its something how the game "sees" it?