Attributes from parent classes are not assignable from child classes

[bigfootjon]

Describe the Bug

See sandbox link, attributes from the parent class can be read but not written

Sandbox Link

https://pyrefly.org/sandbox/?code=MYGwhgzhAEBCkFMBcAoa7oBMEDNoH18BLAOyIBdCAKCBEHAGmhwHsWlpTyBKaAWgB80AHIsSyNBim16AOlYtoAXmZsUKUJBgBhABZEQmKvFrdUU7HhYA3BACc7RbPgU06jVe04ke-IaPFzKQwZHHk2ZU91C1xoAHMESldQ3kFvciDg6DtEgFc7EmhQ8JYgA

(Only applicable for extension issues) IDE Information

No response

[yangdanny97]

I think this is a false positive for the implicitly-defined-attribute error, thanks for flagging.