Cannot alter variable from parent class

Question

I'm building a grid-based game. I have a tile script which is extended to an actor script. This actor script is then extended to a player and an npc script.

The tile script has a variable called "block" as seen here:

@export var block : bool

I am trying to set it so that all "actor" based classes have block set to true by default:

block = true

I get the following error for both my player and npc classes:

Parse Error: Could not resolve super class inheritance from "res://actors/actor.gd".

What have I done wrong?

Comments

I could not reproduce the situation. Don't you have any other clue?

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I'm on the Godot 4.0 Beta, so maybe that's why. But there's not really much other information.

tile.gd :

extends Node2D

@export var block : bool = false

actor.gd :

extends "res://tile.gd"

block = true

player.gd :

extends "res://actors/actor.gd"

Here's the Error I get:

Error at (0, 0): Could not resolve super class inheritance from "res://actors/actor.gd".

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Well, that's the error I get in the player.gd script. In the actor script itself I get an error stating: Unexpected "Identifier" in class body. and it highlights my block = true line

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I don't think the sentence block = true in actor.gd is syntactically correct, it cannot be in preamble. We can write it in _ready() instead.
It is not important, but I am wondering why you don't use class_name for the tile and the actor.