### 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)

}
		}
		previous_character = character;
	}
	Vector<String> clean_parts;
	for (String &part : parts) {
		part = part.strip_edges();
		if (!part.is_empty()) {
			clean_parts.append(part);
		}
	}
	return clean_parts;
}
int ProjectConverter3To4::get_end_parenthesis(const String &line) const {
	int current_state = 0;
	for (int current_index = 0; line.length() > current_index; current_index++) {
		char32_t character = line.get(current_index);
		if (character == '(') {
			current_state++;
		}
		if (character == ')') {
			current_state--;
			if (current_state == 0) {
				return current_index;
			}
		}
	}
	return -1;
}
String ProjectConverter3To4::connect_arguments(const Vector<String> &arguments, int from, int to) const {