GDScript 2.0: Typed assigning an inner class leads to a runtime error

[MikeSchulze]

Godot version

v4.0.beta3.official [01ae26d]

System information

Windows 10

Issue description

I have a function auto_free(<instance>) : Object to register instances to be get auto freed after test execution on my plugin GdUnit3.

The function signature is
func auto_free(obj) -> Object:
and returns the same obj

When going back to the original class, an error occurs at runtime
var instance :AdvancedTestClass.AtmosphereData = auto_free(AdvancedTestClass.AtmosphereData.new())
Trying to assign value of type '' to a variable of type 'AdvancedTestClass.gd'.

Steps to reproduce

Copy this code and run it.

class_name TestScene
extends Node

class Custom:
	pass

func _ready():
	test_wrapper()

func test_wrapper():
	# with this inner class it works
	var original: = TestScene.Custom.new()
	var as_object :TestScene.Custom = auto_free(original)
	prints(as_object)
	
	# with this inner class defined in ExampleClass it breaks
	var original_: = ExampleClass.Data.new()
	# this line fails at runtime
	var as_object_ :ExampleClass.Data = auto_free(original_)

# just return same value 
func auto_free(value :Object) -> Object:
	return value

The external script/class

class_name ExampleClass
extends Resource

class Data:
	pass

Minimal reproduction project

No response

[rune-scape]

just tested that this was an issue on beta 3 and that it's fixed as of #68374 @akien-mga