### 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
return script;
}
ScriptLanguage *GDScriptInstance::get_language() {
	return GDScriptLanguage::get_singleton();
}
const Variant GDScriptInstance::get_rpc_config() const {
	return script->get_rpc_config();
}
void GDScriptInstance::reload_members() {
#ifdef DEBUG_ENABLED
	Vector<Variant> new_members;
	new_members.resize(script->member_indices.size());
	
	for (KeyValue<StringName, GDScript::MemberInfo> &E : script->member_indices) {
		if (member_indices_cache.has(E.key)) {
			Variant value = members[member_indices_cache[E.key]];
			new_members.write[E.value.index] = value;
		}
	}
	members.resize(new_members.size()); 
	
	members = new_members;
	
	member_indices_cache.clear();
	for (const KeyValue<StringName, GDScript::MemberInfo> &E : script->member_indices) {
		member_indices_cache[E.key] = E.value.index;
	}
#endif
}
GDScriptInstance::GDScriptInstance() {