Dance of Cards (1797630) cannot write savedata

**Game information**
Dance of Cards (1797630)

**Distribution name and version where applicable**
Fedora 42

**Flatpak info**
flatpak 1.16.0
default, host gl-drivers

**Problem description**
The game will not create any savedata when run through Flatpak Steam.
In the game's log file the following is seen when run through Flatpak Steam:
```
ERROR: DirAccess::make_dir_recursive: Method failed. Returning: err
At: core\os\dir_access.cpp:184
ERROR: OS::ensure_user_data_dir: Condition "err != OK" is true.
At: core\os\os.cpp:478
Godot Engine v3.3.stable.custom_build.f07bf56e7 - https://godotengine.org

COULDNT LOAD, NEW FILE
SAVED SETTINGS
no save file found
Error with card.sav
Error with card.sav
```

The same is NOT seen when run through Native Steam.

PROTON_LOG (flatpak steam): [steam-1797630.log](https://github.com/user-attachments/files/19428798/steam-1797630.log)

**Does this issue reproduce with native Steam**
The issue is not seen when running the game through native Steam.