Godot crashes, when you change root node to something unpredictable

[Ambear1337]

Tested versions

4.2.1 Steam version

System information

Windows 10

Issue description

I changed Sprite3D to subviewport, while it was root node and godot just closed instantly

Steps to reproduce

1. Create scene with Sprite3D as a root node
2. Give it a texture and enable billboard
3. Change Sprite3D to sub-viewport

Minimal reproduction project (MRP)

It happened once, I tried to make it again, but everything is fine

[ajreckof]

I have checked and it is most likely #78372 which is the culprit and it escalated into a crash now.