### 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)

Vector<String> found_renames;
	int current_line = 1;
	for (String &line : lines) {
		if (uint64_t(line.length()) <= maximum_line_length) {
			for (unsigned int current_index = 0; current_index < cached_regexes.size(); current_index++) {
				if (line.contains(array[current_index][0])) {
					TypedArray<RegExMatch> reg_match = cached_regexes[current_index]->search_all(line);
					if (reg_match.size() > 0) {
						found_renames.append(line_formatter(current_line, array[current_index][0], array[current_index][1], line));
					}
				}
			}
		}
		current_line++;
	}
	return found_renames;
}
// Prints full info about renamed things e.g.:
// Line (67) remove -> remove_at  -  LINE """ doubler._blacklist.remove(0) """
String ProjectConverter3To4::line_formatter(int current_line, String from, String to, String line) {