Noting additional godot crimes during stream:

• self == null during _notification(NOTIFICATION_PREDELETE) https://github.com/godotengine/godot/issues/31166 and https://github.com/godotengine/godot/issues/80834
• What does it mean to call get_viewport().mark_input_as_handled() after awaiting in a input handler callback? Or outside of an input handler, like in process(_delta)?