### Godot version

4.1.beta3

### System information

Fedora Workstation 38 - Godot 4.1.beta3 - Vulkan (Forward+)

### Issue description

**This is an issue created by the production team, we're working on it**

Currently, it's impossible to call virtual functions within GDScript.

This currently returns an error:
```gdscript
# a.gd
extends Node

func _process(delta: float) -> void:
	pass
```

```gdscript
# main.gd
extends Node

var my_node: Node = preload("res://a.gd").new()

func _process(delta: float) -> void:
	my_node._process(delta)  # Cannot call virtual function "_process()" because it hasn't been defined.
```

### Steps to reproduce

1. Create a script (`a.gd`) based on `Node` that declares `_process()`;
2. Create a main node;
3. Attach a script to the main node;
4. Initialize a variable with a new `a.gd` instance;
5. Try to run `_process()` on that node;
6. Find out that it returns an error.

### Minimal reproduction project

[virtual_functions.zip (updated)](https://github.com/godotengine/godot/files/11823992/virtual_functions.zip)


break;
			case GDScriptParser::ClassNode::Member::GROUP:
				
				break;
			case GDScriptParser::ClassNode::Member::UNDEFINED:
				ERR_PRINT("Trying to resolve undefined member.");
				break;
		}
#ifdef DEBUG_ENABLED
		parser->ignored_warnings = previously_ignored_warnings;
#endif
	}
	parser->current_class = previous_class;
}
void GDScriptAnalyzer::resolve_class_interface(GDScriptParser::ClassNode *p_class, const GDScriptParser::Node *p_source) {
	if (p_source == nullptr && parser->has_class(p_class)) {
		p_source = p_class;
	}
#ifdef DEBUG_ENABLED
	bool has_static_data = p_class->has_static_data;
#endif
	if (!p_class->resolved_interface) {
		if (!parser->has_class(p_class)) {
			String script_path = p_class->get_datatype().script_path;
			Ref<GDScriptParserRef> parser_ref = get_parser_for(script_path);
			if (parser_ref.is_null()) {
				push_error(vformat(R"(Could not find script "%s".)", script_path), p_source);
				return;
			}
			Error err = parser_ref->raise_status(GDScriptParserRef::PARSED);