I can confirmed that the zombies not only glitch half clipping through doors but also walls,but they know its an obstacles they cant get through in.
I've tried do the steps above, and zombie can't go inside Anymore which is a big improvement than the previous in terms of zombie navigation.
But they can go around outside the house and glitching and clipping only a half but cant chase me
But sometimes they glitch and clipped through The whole door and get inside, unintentionally