The scene is a GUI scene with two buttons in HBoxContainer. But the buttons themselves are sub-scenes of one and the same type
This scene can not be loaded using load() or preload(). Null is returned. And this type of Null is destructive for other code following the load() line, see https://godotengine.org/qa/81777/gdscript-strange-behavior-a-bug
Such a scene can only be shown using F6 or being a part of an autorun scene.
But if I remove either one of the buttons.
Now it can be loaded no problem. What is it? A bug or a feature? How can I load a scene dynamically with more than one subscene?
Godot version is 3.2.2 built from source.