Please point issues with the flatpak release to https://github.com/bitwarden/clients/issues.
Electron (the technology used to build the Bitwarden Desktop app) may not play nicely with Wayland at the current moment, especially in GNOME.
Regardless, you have the ability to try out Wayland by setting the environment variable ELECTRON_OZONE_PLATFORM_HINT=auto
and giving access to the Wayland socket.
flatpak override --user --env=ELECTRON_OZONE_PLATFORM_HINT=auto com.bitwarden.desktop
flatpak override --user --socket=wayland com.bitwarden.desktop
When using Wayland, it is also safe to disable X11 and IPC access from the Flatpak sandbox.
flatpak override --user --nosocket=x11 com.bitwarden.desktop
flatpak override --user --unshare=ipc com.bitwarden.desktop
You can also use Flatseal to manage these via a GUI.