見つかったバグに対するメンテナのコメントが3D面での弱さを物語ってる
4.0を契機に大勢が使うようになれば変わるんだろうな

https://github.com/godotengine/godot/issues/42895

> This is quite a major bug actually, it is a good thing few people were using Godot physics in 3D, this could have caused all kinds of buggy behaviour.