### 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)

} else if (file_name.ends_with("project.godot")) {
				changed_elements.append_array(check_for_rename_common(RenamesMap3To4::project_godot_renames, reg_container.project_godot_regexes, lines));
				changed_elements.append_array(check_for_rename_common(RenamesMap3To4::builtin_types_renames, reg_container.builtin_types_regexes, lines));
				changed_elements.append_array(check_for_rename_input_map_scancode(lines, reg_container));
				changed_elements.append_array(check_for_rename_joypad_buttons_and_axes(lines, reg_container));
				changed_elements.append_array(check_for_rename_common(RenamesMap3To4::input_map_renames, reg_container.input_map_regexes, lines));
			} else if (file_name.ends_with(".csproj")) {
				
			} else {
				ERR_PRINT(vformat("\"%s\", is not supported!", file_name));
				continue;
			}
			for (String &line : lines) {
				if (uint64_t(line.length()) > maximum_line_length) {
					ignored_lines += 1;
				}
			}
		} else {
			reason.append(vformat("\tERROR: File has exceeded the maximum size allowed  - %d KB.", maximum_file_size / 1024));
			is_ignored = true;
		}
		uint64_t end_time = Time::get_singleton()->get_ticks_msec();
		String end_message = vformat("    Checking file took %10.3f ms.", (end_time - start_time) / 1000.0);
		if (ignored_lines != 0) {
			end_message += vformat(" Ignored %d lines, because their length exceeds maximum allowed characters - %d.", ignored_lines, maximum_line_length);
		}
		print_line(end_message);
		for (int k = 0; k < reason.size(); k++) {
			print_line(reason[k]);
		}