### 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)


result.kind = GDScriptParser::DataType::BUILTIN;
		result.builtin_type = p_property.type;
		if (p_property.type == Variant::ARRAY && p_property.hint == PROPERTY_HINT_ARRAY_TYPE) {
			
			StringName elem_type_name = p_property.hint_string;
			GDScriptParser::DataType elem_type;
			elem_type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
			Variant::Type elem_builtin_type = GDScriptParser::get_builtin_type(elem_type_name);
			if (elem_builtin_type < Variant::VARIANT_MAX) {
				
				elem_type.kind = GDScriptParser::DataType::BUILTIN;
				elem_type.builtin_type = elem_builtin_type;
			} else if (class_exists(elem_type_name)) {
				elem_type.kind = GDScriptParser::DataType::NATIVE;
				elem_type.builtin_type = Variant::OBJECT;
				elem_type.native_type = p_property.hint_string;
			} else if (ScriptServer::is_global_class(elem_type_name)) {
				
				Ref<Script> script = ResourceLoader::load(ScriptServer::get_global_class_path(elem_type_name));
				elem_type.kind = GDScriptParser::DataType::SCRIPT;
				elem_type.builtin_type = Variant::OBJECT;
				elem_type.native_type = script->get_instance_base_type();
				elem_type.script_type = script;
			} else {
				ERR_FAIL_V_MSG(result, "Could not find element type from property hint of a typed array.");
			}
			elem_type.is_constant = false;
			result.set_container_element_type(elem_type);
		} else if (p_property.type == Variant::INT) {