### 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)

valid = valid && test_conversion_gdscript_builtin("var rr = JSON.parse(a)", "var test_json_conv = JSON.new()\ntest_json_conv.parse(a)\nvar rr = test_json_conv.get_data()", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("empty()", "is_empty()", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin(".empty", ".empty", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin(").roman(", ").roman(", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\t.roman(", "\tsuper.roman(", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin(" .roman(", " super.roman(", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin(".1", ".1", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin(" .1", " .1", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("'.'", "'.'", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("'.a'", "'.a'", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\t._input(_event)", "\tsuper._input(_event)", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("(connect(A,B,C) != OK):", "(connect(A, Callable(B, C)) != OK):", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("(connect(A,B,C,D) != OK):", "(connect(A, Callable(B, C).bind(D)) != OK):", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("(connect(A,B,C,[D]) != OK):", "(connect(A, Callable(B, C).bind(D)) != OK):", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("(connect(A,B,C,[D,E]) != OK):", "(connect(A, Callable(B, C).bind(D,E)) != OK):", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("(connect(A,B,C,[D,E],F) != OK):", "(connect(A, Callable(B, C).bind(D,E), F) != OK):", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("(connect(A,B,C,D,E) != OK):", "(connect(A, Callable(B, C).bind(D), E) != OK):", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin(".connect(A,B,C)", ".connect(A, Callable(B, C))", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("abc.connect(A,B,C)", "abc.connect(A, Callable(B, C))", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tconnect(A,B,C)", "\tconnect(A, Callable(B, C))", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin(" connect(A,B,C)", " connect(A, Callable(B, C))", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("_connect(A,B,C)", "_connect(A,B,C)", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("do_connect(A,B,C)", "do_connect(A,B,C)", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("$connect(A,B,C)", "$connect(A,B,C)", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("@connect(A,B,C)", "@connect(A,B,C)", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("(start(A,B) != OK):", "(start(Callable(A, B)) != OK):", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("func start(A,B):", "func start(A,B):", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("(start(A,B,C,D,E,F,G) != OK):", "(start(Callable(A, B).bind(C), D, E, F, G) != OK):", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("disconnect(A,B,C) != OK):", "disconnect(A, Callable(B, C)) != OK):", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("is_connected(A,B,C) != OK):", "is_connected(A, Callable(B, C)) != OK):", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);