### 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)

int current_element = 0;
		while (RenamesMap3To4::gdscript_function_renames[current_element][0] != nullptr) {
			String name_3_x = RenamesMap3To4::gdscript_function_renames[current_element][0];
			String name_4_0 = RenamesMap3To4::gdscript_function_renames[current_element][1];
			if (!all_functions.has(name_4_0)) {
				ERR_PRINT(vformat("Missing GDScript function in pair (%s - ===> %s <===)", name_3_x, name_4_0));
				valid = false;
			}
			current_element++;
		}
	}
	if (!valid) {
		ERR_PRINT("Found function which is used in the converter, but it cannot be found in Godot 4. Rename this element or remove its entry if it's obsolete.");
	}
	valid = valid && test_single_array(RenamesMap3To4::enum_renames);
	valid = valid && test_single_array(RenamesMap3To4::class_renames, true);
	valid = valid && test_single_array(RenamesMap3To4::gdscript_function_renames, true);
	valid = valid && test_single_array(RenamesMap3To4::csharp_function_renames, true);
	valid = valid && test_single_array(RenamesMap3To4::gdscript_properties_renames, true);
	valid = valid && test_single_array(RenamesMap3To4::csharp_properties_renames, true);
	valid = valid && test_single_array(RenamesMap3To4::shaders_renames, true);
	valid = valid && test_single_array(RenamesMap3To4::gdscript_signals_renames);
	valid = valid && test_single_array(RenamesMap3To4::project_settings_renames);
	valid = valid && test_single_array(RenamesMap3To4::project_godot_renames);
	valid = valid && test_single_array(RenamesMap3To4::input_map_renames);
	valid = valid && test_single_array(RenamesMap3To4::builtin_types_renames);
	valid = valid && test_single_array(RenamesMap3To4::color_renames);
	return valid;
}
bool ProjectConverter3To4::test_single_array(const char *p_array[][2], bool p_ignore_4_0_name) {