I ended up compiling it with cargo because the AppImage needs a glibc>=2.32 (i have glibc 2.31). I copied the user data from gossip's flatpak dir (~/.var/app/com.mikedilger/gossip) into ~/.local/share/gossip but when i start it, it ignores the config and shows the dialog to create a new key.

I'll stay on 0.11.3 for now until i figure out how to properly migrate my existing gossip data files.