### 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 (base.is_hard_type()) {
#ifdef SUGGEST_GODOT4_RENAMES
						String rename_hint = String();
						if (GLOBAL_GET(GDScriptWarning::get_settings_path_from_code(GDScriptWarning::Code::RENAMED_IN_GODOT_4_HINT)).booleanize()) {
							const char *renamed_identifier_name = check_for_renamed_identifier(name, p_identifier->type);
							if (renamed_identifier_name) {
								rename_hint = " " + vformat(R"(Did you mean to use "%s"?)", renamed_identifier_name);
							}
						}
						push_error(vformat(R"(Cannot find property "%s" on base "%s".%s)", name, base.to_string(), rename_hint), p_identifier);
#else
						push_error(vformat(R"(Cannot find property "%s" on base "%s".)", name, base.to_string()), p_identifier);
#endif 
					}
				}
			}
		}
		return;
	}
	GDScriptParser::ClassNode *base_class = base.class_type;
	List<GDScriptParser::ClassNode *> script_classes;
	bool is_base = true;
	if (base_class != nullptr) {
		get_class_node_current_scope_classes(base_class, &script_classes);
	}
	bool is_constructor = base.is_meta_type && p_identifier->name == SNAME("new");
	for (GDScriptParser::ClassNode *script_class : script_classes) {
		if (p_base == nullptr && script_class->identifier && script_class->identifier->name == name) {
			reduce_identifier_from_base_set_class(p_identifier, script_class->get_datatype());
			return;