@coderus: thanks a lot!

Do you have such folders/files as /plat_property_contexts and /nonplat_property_contexts in /?

It looks like properties (Android) are not loaded properly and that leads to wrong gralloc lib loaded in Flatpak.

Please send "ls /"

If those folders are indeed there, you can test by running flatpak with extra arguments:

--filesystem=/plat_property_contexts:ro --filesystem=/nonplat_property_contexts:ro