Renaming instances in the project editor does not rename it's level folder

[sooooosh]

Describe the bug

Renaming a custom instance in the level editor will only change the instance ID in the main.xml, but not actually rename it's folder in levels/instances/. When trying to spawn the renamed instance, the game will crash since the instance doesn't have a level anymore.

Workaround is to manually rename the instance folder, but having it automatically rename would of course be much more convenient.

Steps to reproduce the issue

Create a custom instance.
Rename the instance via the project editor.
Spawn the renamed instance.
Crash.

Log file

No response

Minimal reproduction

No response