Heads up: "On certain devices (Adreno-based GPUs, e.g. OnePlus 6) Flatpaks apps using GTK4 might fail to start with a currently unknown reason.
As a temporary workaround, you can start flatpak apps with GSK_RENDERER=ngl as environment variable."
pmaports issue:
https://gitlab.postmarketos.org/postmarketOS/pmaports/-/issues/3655
edge blog post (same text):
https://postmarketos.org/edge/2025/04/13/gtk4-flatpak-apps-fail-to-start/