Modrinth loading unusable, grey window on Linux

[scytail]

Please confirm the following.

• I checked the existing issues for duplicate problems (I also looked at the linux "mega-issue" and it appears to primarily be a discussion around a different problem)
• I have tried resolving the issue using the support portal
• I have ensured my Modrinth App installation is up to date

What version of the Modrinth App are you using?

0.10.27

What operating systems are you seeing the problem on?

Linux

Describe the bug

Launching the Modrinth app on Linux Mint 22.3 Cinnamon 64-bit loads a grey window. I've tried reinstalling via flatpak a few times with no success, despite the installer saying there were no installation issues, even in the command line when attempted that way.

I have also tried launching modrinth by running the command

flatpak run com.modrinth.ModrinthApp

which results in the following error messages (and the usual grey window):

Gtk-Message: 08:00:44.267: Failed to load module "xapp-gtk3-module"
Gtk-Message: 08:00:44.430: Failed to load module "xapp-gtk3-module"
Failed to create GBM buffer of size 1280x800: Invalid argument

Steps to reproduce

1. Install Modrinth 0.10.27 via flatpak (either using the file or the command line
2. execute the command flatpak run com.modrinth.ModrinthApp in a command line
3. Observe erroneous behavior

Expected behavior

Expected the window to open with visual, interactive elements and no error messages in the console.

Additional context

It appears that there's some sort of improper reference or missing installation module to gtk3 which is causing the rendering issues.

Interestingly enough, I've noticed that as I move my mouse around the grey window, it appears to change and react to invisible elements. I believe the window is fully functional, it's just not rendering any of the elements on screen (likely due to the missing module). For example, if I click at the top-right of the window (where the close button should be), the window closes as expected.

[Eatriot]

I've had the exact same issue.
Running this just fixed it:
flatpak override --user --env=WEBKIT_DISABLE_DMABUF_RENDERER=1 com.modrinth.ModrinthApp

[scytail]

This fixed it for me, though I'm still seeing the GTK3 errors.