### 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)


}
		if (is_base) {
			is_base = script_class->base_type.class_type != nullptr;
			if (!is_base && p_base != nullptr) {
				break;
			}
		}
	}
	
	const StringName &native = base.native_type;
	if (class_exists(native)) {
		if (is_constructor) {
			name = "_init";
		}
		MethodInfo method_info;
		if (ClassDB::has_property(native, name)) {
			StringName getter_name = ClassDB::get_property_getter(native, name);
			MethodBind *getter = ClassDB::get_method(native, getter_name);
			if (getter != nullptr) {
				bool has_setter = ClassDB::get_property_setter(native, name) != StringName();
				p_identifier->set_datatype(type_from_property(getter->get_return_info(), false, !has_setter));
				p_identifier->source = GDScriptParser::IdentifierNode::INHERITED_VARIABLE;
			}
			return;
		}
		if (ClassDB::get_method_info(native, name, &method_info)) {
			
			p_identifier->set_datatype(make_callable_type(method_info));
			p_identifier->source = GDScriptParser::IdentifierNode::INHERITED_VARIABLE;
			return;