### 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(button_index_entry, ",\"button_index\":" + String::num_int64(reg_container.joypad_button_mappings[button_index_value]) + "," + pressure_and_pressed_properties);
				}
			}
			// 
			reg_match = reg_container.joypad_axis.search_all(line);
			for (int i = 0; i < reg_match.size(); ++i) {
				Ref<RegExMatch> match = reg_match[i];
				PackedStringArray strings = match->get_strings();
				String axis_entry = strings[0];
				int axis_value = strings[1].to_int();
				if (axis_value == 6) {
					line = line.replace(axis_entry, ",\"axis\":4");
				} else if (axis_value == 7) {
					line = line.replace(axis_entry, ",\"axis\":5");
				}
			}
		}
	}
}
Vector<String> ProjectConverter3To4::check_for_rename_joypad_buttons_and_axes(Vector<String> &lines, const RegExContainer &reg_container) {
	Vector<String> found_renames;
	int current_line = 1;
	for (String &line : lines) {
		if (uint64_t(line.length()) <= maximum_line_length) {
			// 
			TypedArray<RegExMatch> reg_match = reg_container.joypad_button_index.search_all(line);
			for (int i = 0; i < reg_match.size(); ++i) {
				Ref<RegExMatch> match = reg_match[i];
				PackedStringArray strings = match->get_strings();
				String button_index_entry = strings[0];