My bad, there are only dev builds running on suzuran, it seems, and recent (up to) Android 11 dev builds got Rooted debugging removed in favour of passing SafetyNet … SafetyNet on /e/OS Community "dev" devices - let it in or not? … I always confuse which Android version is needed to have this back.
/e/OS dev based on Android 12 would have Rooted debugging again, but there doesn’t seem to be a further upgrade available for suzuran.