Referencing other custom class from inner class will generate same custom class script as a built in script, and replace other custom class nodes' scripts with that built in script.

[Kakiroi]

Tested versions

Reproducible in : Godot v4.4.dev3
Not reproducible in : Godot_v4.3 stable

System information

Godot v4.4.dev3 - Windows 10.0.22631 - Single-window, 2 monitors - Vulkan (Forward+) - dedicated GeForce RTX 2070 SUPER

Issue description

Just reference other custom class at any point in inner class (var b:B, b = b as B) will generate the same script as the custom class as a built in script. Then Godot will replace the original script with the built in script in the scene.

Steps to reproduce

In the MRP, remove inner class in Node A. When you save, it will generate built in script that replaces Node B's script.

Minimal reproduction project (MRP)

errorscriptgeneration.zip

[HolonProduction]

Bisected to 9853a69 (#78656) CC @Repiteo