Editor Crash on opening scene - ERROR: Index p_index = 1 is out of bounds (((Vector<T> *)(this))->_cowdata.size() = 0). at: operator[] (./core/templates/vector.h:52)

[timshannon]

Godot version

v4.0.alpha.mono.custom_build [fa2b326]

System information

Ubuntu 22.04

Issue description

Opening a scene that opened find in previous versions now crashes the editor.

The last error before the stack trace is

ERROR: Index p_index = 1 is out of bounds (((Vector<T> *)(this))->_cowdata.size() = 0).
   at: operator[] (./core/templates/vector.h:52)

The full terminal output is attached in out.txt.

It appears to be an issue to the CSG nodes in the scene. If I can find a previous GD4 alpha version in which the scene opens fine, I'll include that in this issue so it's easier to find a diff.

Steps to reproduce

Open the attached project, then open the TestEnemy.tscn scene.

Minimal reproduction project

Bug.zip
out.txt

[timshannon]

It opens fine in Alpha 7 but not Alpha 8.

[timshannon]

I believe this PR is what is causing this specific crash for me:

#51591

The build from the PR merged prior to #51591 (#46208) works fine.

[Calinou]

Duplicate of #60936.