### 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)


ERR_FAIL_COND_MSG(!parser->valid_annotations.has(p_annotation->name), vformat(R"(Annotation "%s" not found to validate.)", p_annotation->name));
	if (p_annotation->is_resolved) {
		return;
	}
	p_annotation->is_resolved = true;
	const MethodInfo &annotation_info = parser->valid_annotations[p_annotation->name].info;
	const List<PropertyInfo>::Element *E = annotation_info.arguments.front();
	for (int i = 0; i < p_annotation->arguments.size(); i++) {
		GDScriptParser::ExpressionNode *argument = p_annotation->arguments[i];
		const PropertyInfo &argument_info = E->get();
		if (E->next() != nullptr) {
			E = E->next();
		}
		reduce_expression(argument);