They have never been able to before, and now it has happened multiple times in the past few days on my survival world

Reproduce:

Place a door reversed so zombies cant break it.... and they still can.

Edit: This is not a duplicate of that report. I am specifically referring to placing a door on the inside of the doorway so it is flush with the inside rather than the outside. Zombies have never been able to break doors from the inside, yet now they can?

Edit: apparently they cant break OPEN doors, so you can place it sideways so the door is "open" then "close" it. The door will technically be open and zombies cant break it.