The app doesn't start on flatpak

[dbkblk]

Describe the bug

I've just installed the latest version of Cinny via Flatpak, to try it.

The app crash with no obvious error:

❯ flatpak run in.cinny.Cinny -v

** (cinny:2): WARNING **: 09:31:48.710: webkit_settings_set_enable_offline_web_application_cache is deprecated and does nothing.
Asset `public/locales/fr.json` not found; fallback to public/locales/fr.json.html

Note : I've tried start the appimage v4.10.1 and it doesn't start neither with (the app start but the screen stay empty) :

❯ ./Cinny_desktop-x86_64.AppImage 

** (cinny:9140): WARNING **: 09:36:30.589: webkit_settings_set_enable_offline_web_application_cache is deprecated and does nothing.
Could not create default EGL display: EGL_BAD_PARAMETER. Aborting...

** (cinny:9140): WARNING **: 09:36:55.625: atk-bridge: get_device_events_reply: unknown signature

Reproduction

No response

Expected behavior

The app should start and display a welcome screen.

Platform and versions

OS : Gentoo
Cinny : 4.10.0

Additional context

No response