Cannot extend an Inner Class

[bitwes]

Godot version

4.0.alpha16.official.86dd3f312

System information

OSX 10.15.7

Issue description

When you attempt to extend an Inner Class it extends the base script instead.

Steps to reproduce

Given:
res://has_inner_classes.gd

class InnerClassA:

    func hello():
        print('world')

res://main.gd

extends SceneTree

var HasInnerClasses = load('res://has_inner_classes.gd')

class ExtendsInnerClassA:
    extends "res://has_inner_classes.gd".InnerClassA

func _init():
    var inst = ExtendsInnerClassA.new()
    if(inst is HasInnerClasses):
        print('instance is a HasInnerClasses')
    if(inst is HasInnerClasses.InnerClassA):
        print('instance is a InnerClassA')

    quit()

Running main.gd in 3.5.stable.official.991bb6ac7 prints:

instance is a InnerClassA

Running main.gd in 4.0.alpha16.official.86dd3f312 prints:

instance is a HasInnerClasses

Minimal reproduction project

Godot4ExtendInnerClass.zip

[Chaosus]

I've tested it, and it seems to be fixed at 11e1c83 (probably by #68374).