The Bug
Every zombie is able to break doors, but they are supposed to only have a specific chance to be able to break doors, which also depends on the local difficulty like on java edition. This affects normal zombies, drowneds and husks.
How to reproduce:
Make sure to play on hard difficulty and have gamerule mobgriefing set to true
Lock up a villager and place a wooden door
Spawn a zombie
The zombie will be able to break the door
Kill it
Spawn a new zombie and repeat that over and over again
Expected result: Not every zombie will break the door.
Actual result: Every zombie broke the door.
I noticed this in survival it happened very often that a zombie broke a door, because of this bug.
Attachments
Comments

Minecraft has several different editions, and some features vary from edition to edition. Often this happens when one edition evolves faster than another, and tweaks or balances are made that don't propagate immediately to other editions.
Parity issues introduced before Java Edition 1.15/Bedrock Edition 1.14 are not tracked on the bug tracker but should instead be reported on the Feedback website.

Really? This is not a bug? I always thought it would be a bug and not just a parity issue that isnβt a bug. Did zombies even ever only have a chance to be able to break doors? If this even was the case, I think it should be reopened.
I'm not sure about that, zombies having the ability to break doors was implemented in 0.12.1 build 1.

I now remember a time where I had zombies not breaking my doors in survival while playing on hard difficulty. Zombies definitely used to only have a chance of being able to break doors. In versions 1.7, 1.8, 1.9, 1.11, I never had zombies breaking my doors on hard difficulty in survival. Semms like this bug was introduced in 1.12. So seems like zombies used to only have a chance of being able to break doors. Can you please reopen that ticket? If zombies used to only have a chance to be able to break doors, this is definitely a bug.

I think zombies can always break doors. If any zombie wanted to break my door, it would break. I think this is not a bug.

Yeah, I think I heard something about that in 1.12 they made all zombies can break doors.
In 1.11.4 I always get zombies with the ability to break doors on hard mode.

I didn't simply mean this as a parity issue. This has massive impact in survival worlds. Zombies are breaking doors very often, this seems to be a bug.
Reopened per user request.
Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response
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Affects 1.17.40.20