Shared via mypy Playground

main.py

from typing import Self, reveal_type

class NodeA:
    def __init__(self: Self) -> None:
        reveal_type(self)  # Self`0
        self.myself: Self = self  # ✅️

class NodeB:
    def __init__(self) -> None:
        reveal_type(self)  # __main__.NodeB
        self.myself: Self = self  # ❌️