### Godot version

4.0.beta10

### System information

Windows 11

### Issue description
UPDATE: This problem only occurs when the source code contains inner classes

Before 4.0.Beta9, I could get a GDScript instance by `GDScript.new()` and then set the `source_code` property and then `reload()`, but now it throws an error 
```
USER SCRIPT ERROR: Parse Error: Could not find script "".
   at: GDScript::reload (built-in:1644)
```
In my software, I use the above method when the user modifies the code text, and then read the godot log to implement real-time error checking of the custom user script editor. But now this functionality is completely broken

### Steps to reproduce

1. Create a GDScript instance by `GDScript.new()`
2. set the `source_code` property and then `reload()`

### Minimal reproduction project

N/A
owner = _baseptr->native->instantiate();
	} else {
		owner = memnew(RefCounted); 
	}
	ERR_FAIL_COND_V_MSG(!owner, Variant(), "Can't inherit from a virtual class.");
	RefCounted *r = Object::cast_to<RefCounted>(owner);
	if (r) {
		ref = Ref<RefCounted>(r);
	}
	GDScriptInstance *instance = _create_instance(p_args, p_argcount, owner, r != nullptr, r_error);
	if (!instance) {
		if (ref.is_null()) {
			memdelete(owner); 
		}
		return Variant();
	}
	if (ref.is_valid()) {
		return ref;
	} else {
		return owner;
	}
}
bool GDScript::can_instantiate() const {
#ifdef TOOLS_ENABLED
	return valid && (tool || ScriptServer::is_scripting_enabled());
#else
	return valid;
#endif
}
Ref<Script> GDScript::get_base_script() const {