### 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)


Array array = p_array->get_datatype().has_container_element_type() ? make_array_from_element_datatype(p_array->get_datatype().get_container_element_type()) : Array();
	array.resize(p_array->elements.size());
	for (int i = 0; i < p_array->elements.size(); i++) {
		GDScriptParser::ExpressionNode *element = p_array->elements[i];
		bool is_element_value_reduced = false;
		Variant element_value = make_expression_reduced_value(element, is_element_value_reduced);
		if (!is_element_value_reduced) {
			return Variant();
		}
		array[i] = element_value;
	}
	array.make_read_only();
	is_reduced = true;
	return array;
}
Variant GDScriptAnalyzer::make_dictionary_reduced_value(GDScriptParser::DictionaryNode *p_dictionary, bool &is_reduced) {