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Vulkan error for flatpaks
(programming.dev)
Setting the environmental variable
GSK_RENDERER=gl
in Flatseal or on your entire system should fix the issue. It tells GTK to use the old OpenGL renderer backend for GTK. Once the issue is fixed upstream, it would be a good idea to remove the change.
After updating freedesktop.Platform
with flathub the problem has been solved.
The beloved lightweight distro