Unexpected Behavior:
Zombies tear down random doors, even though there is absolutely nothing behind them.
Expected Behavior:
Zombies should only break doors that their target has recently gone through, or if they sense a target behind the door (villagers, players)
Steps to Reproduce:
Build several small buildings with a door entrance.
Spawn several zombies.
Notice that they break the doors. Make sure you are in creative so that they do not target you.
Thank you for your report!
However, this issue has been closed as Working as Intended.
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