### 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 (line.contains("OS.get_screen_count")) {
		line = line.replace("OS.get_screen_count", "DisplayServer.get_screen_count");
	}
	if (line.contains("OS.get_screen_dpi")) {
		line = line.replace("OS.get_screen_dpi", "DisplayServer.screen_get_dpi");
	}
	if (line.contains("OS.get_screen_max_scale")) {
		line = line.replace("OS.get_screen_max_scale", "DisplayServer.screen_get_max_scale");
	}
	if (line.contains("OS.get_screen_position")) {
		line = line.replace("OS.get_screen_position", "DisplayServer.screen_get_position");
	}
	if (line.contains("OS.get_screen_refresh_rate")) {
		line = line.replace("OS.get_screen_refresh_rate", "DisplayServer.screen_get_refresh_rate");
	}
	if (line.contains("OS.get_screen_scale")) {
		line = line.replace("OS.get_screen_scale", "DisplayServer.screen_get_scale");
	}
	if (line.contains("OS.get_screen_size")) {
		line = line.replace("OS.get_screen_size", "DisplayServer.screen_get_size");
	}
	if (line.contains("OS.set_icon")) {
		line = line.replace("OS.set_icon", "DisplayServer.set_icon");
	}
	if (line.contains("OS.set_native_icon")) {
		line = line.replace("OS.set_native_icon", "DisplayServer.set_native_icon");
	}
	// 
	if (line.contains("OS.window_borderless")) {
		line = line.replace("OS.window_borderless", "get_window().borderless");