### Godot version

4.0 RC1

### System information

Linux Mint 20.3 Cinnamon

### Issue description

Tried converting a 3.5 game to 4.0 RC1. The conversion popup menu closed after a few seconds, and trying to edit the game crashes the entire engine with the following errors, which seem to be related to one music file not loading:
![errors](https://user-images.githubusercontent.com/125468288/219127087-f5a78035-4e4a-4625-aadb-e0cde6d5ac3d.png)

Not sure what's causing the issue, because when I created a new project with only that file and converted it I didn't get these errors, but consistently get them when trying to convert that game.

### Steps to reproduce

- Download the reproduction project below
- Import in Godot 4.0, and click "convert full project"
- If the bug happens, the engine will crash whenever trying to edit or run the converted project

### Minimal reproduction project

[Music Convertor Crash Demo.zip](https://github.com/godotengine/godot/files/10746591/Music.Convertor.Crash.Demo.zip)

if (from.size() > 200) {
		from = from.substr(0, 197) + "...";
	}
	if (to.size() > 200) {
		to = to.substr(0, 197) + "...";
	}
	if (line.size() > 400) {
		line = line.substr(0, 397) + "...";
	}
	from = from.strip_escapes();
	to = to.strip_escapes();
	line = line.replace("\r", "").replace("\n", "").strip_edges();
	return vformat("Line(%d), %s -> %s  -  LINE \"\"\" %s \"\"\"", current_line, from, to, line);
}
// Prints only full lines e.g.:
// Line (1) - FULL LINES - """yield(get_tree().create_timer(3), 'timeout')"""  =====>  """ await get_tree().create_timer(3).timeout """
String ProjectConverter3To4::simple_line_formatter(int current_line, String old_line, String new_line) {