### 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 (parts.size() >= 3) {
					line_new += starting_space + base_obj + "set_(" + parts[2] + ")\n";
				}
				// 
				if (parts.size() >= 4) {
					line_new += starting_space + base_obj + "set_floor__enabled(" + parts[3] + ")\n";
				}
				// 
				if (parts.size() >= 5) {
					line_new += starting_space + base_obj + "set_(" + parts[4] + ")\n";
				}
				// 
				if (parts.size() >= 6) {
					line_new += starting_space + base_obj + "set_(" + parts[5] + ")\n";
				}
				// 
				if (parts.size() >= 7) {
					line_new += starting_space + "# TODOConverter40 infinite_inertia were removed in Godot 4.0 - previous value `" + parts[6] + "`\n";
				}
				line_new += starting_space + base_obj + "move_and_slide()";
				if (!line.begins_with(starting_space + "move_and_slide_with_")) {
					line = line_new + "\n" + line.substr(0, start) + "velocity" + line.substr(end + start);
				} else {
					line = line_new + line.substr(end + start);
				}
			}
		}
	}
	// 
	if (contains_function_call(line, "sort_custom(")) {