dataclass with slots=True, init=False raises AttributeError

Python 3.10.4
dataclass with slots=True, init=False raises AttributeError on attribute access

from dataclasses import dataclass

@dataclass(slots=True, init=False)
class WorldState:
    is_mission_running: bool = False

w = WorldState()
w.is_mission_running

Traceback (most recent call last):
File "", line 1, in
AttributeError: 'WorldState' object has no attribute 'is_mission_running'