Gnome flatpaks apps are crashing or not opening

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Try the environment variableGSK_RENDERER=ngl or gl; the default renderer is vulkan on Wayland (which also works with regular apps, but not sure about Flatpaks).

I believe launching the Flatpak with the env would be good-enough, but you can also set that globally (I do vulkan globally in profile.d like this):

sudo -e '/etc/profile.d/99-tweaks.sh'

# GTK
export GSK_RENDERER='vulkan'

Reboot → export -p | grep 'GSK_RENDERER'

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