Cyclic dependency error with custom data types creating more of themselves

[TimCoraxAudio]

Godot version: 3.3.2
OS/device including version: Xubuntu 20.10

Issue description: If using a custom class and that class needs to create more of itself, a cyclic dependency error ensues

Steps to reproduce:

extends Node
class_name Item

var count: int
var item_id: int

func split_item(amount: int) -> Item:
    var item = Item.new(item_id, amount)
    count -= amount
    return item

I know this can be prevented by doing:

func split_stack(amount: int) -> Item:
	var item = self.duplicate()
	item.count = amount
	count -= amount
	return item

But this is doing essentially the same thing. It also took me a long time to find this problem because the error came up in other classes at the end of the file

[nonunknown]

Duplicate of #43529 & #21461

[Calinou]

Closing per @nonunknown's comment.