### 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
if (globals.has(p_name)) {
		
		global_array.write[globals[p_name]] = p_value;
		return;
	}
	globals[p_name] = global_array.size();
	global_array.push_back(p_value);
	_global_array = global_array.ptrw();
}
void GDScriptLanguage::add_global_constant(const StringName &p_variable, const Variant &p_value) {
	_add_global(p_variable, p_value);
}
void GDScriptLanguage::add_named_global_constant(const StringName &p_name, const Variant &p_value) {
	named_globals[p_name] = p_value;
}
Variant GDScriptLanguage::get_any_global_constant(const StringName &p_name) {
	if (named_globals.has(p_name)) {
		return named_globals[p_name];
	}
	if (globals.has(p_name)) {
		return _global_array[globals[p_name]];
	}
	ERR_FAIL_V_MSG(Variant(), vformat("Could not find any global constant with name: %s.", p_name));
}
void GDScriptLanguage::remove_named_global_constant(const StringName &p_name) {
	ERR_FAIL_COND(!named_globals.has(p_name));
	named_globals.erase(p_name);
}
void GDScriptLanguage::init() {