If you have that permission screen come up every time, it means that permissions are not granted correctly by exposed, which affects reboot to recovery as well.
Please provide xposed verbose and module logs, and also an adb logcat, all after opening firefds kit and trying to reboot to recovery. Also try to reinstall firefds kit without uninstalling it reboot and try again
I tried reinstalling. Still couldn't allow permissions.. so i uninstalled and reinstalled latest version, it can't even see module as active. Same with old version. Allow permissions is still greyed out. Does it require root? It doesn't prompt or show up in magisk