### 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)

line = line.replace("OS.GetWindowSafeArea()", "DisplayServer.ScreenGetUsableRect()");
	// 
	if (line.contains("GetTree().SetInputAsHandled()")) {
		line = line.replace("GetTree().SetInputAsHandled()", "GetViewport().SetInputAsHandled()");
	}
	// 
	// 
	if (line.contains("_UnhandledKeyInput(InputEventKey @event)")) {
		line = line.replace("_UnhandledKeyInput(InputEventKey @event)", "_UnhandledKeyInput(InputEvent @event)");
	}
	// 
	if (line.contains("Connect(")) {
		int start = line.find("Connect(");
		// 
		if (start == 0 || line.get(start - 1) != 's') {
			int end = get_end_parenthesis(line.substr(start)) + 1;
			if (end > -1) {
				Vector<String> parts = parse_arguments(line.substr(start, end));