Why don't filters work?

Question

typescript

Good afternoon, Filters do not work correctly if you add several items and mark some of them with a circle on the left and then click on any of the All, Active, Complete buttons . It seems to me that the problem in rootReducer is data immutability. I just don't know how to solve this problem.

link to example: https://codesandbox.io/s/clever-kepler-43ncs?file=...