Endermen lose retaliation AI when attacked with specific gamerules set

[partydev]

What behaviour is expected:

Enderman retaliates when being attacked with specific gamerules set.

What behaviour is observed:

Endermen does not retaliate when being attacked with specific gamerules set.

Steps/models to reproduce:

Set forgiveDeadPlayers to false, set universalAnger to true, punch enderman in the legs.

Plugin list:

none

Paper version:

This server is running Paper version git-Paper-457 (MC: 1.16.5) (Implementing API version 1.16.5-R0.1-SNAPSHOT)

Anything else:

This was reported by a user in Discord that refused to make a ticket here, I tested it and it appears to cause this issue. It seems to work differently in Vanilla (endermen retaliates there).

[Prof-Bloodstone]

Can confirm this is a bukkit issue. Reported upstream: https://hub.spigotmc.org/jira/browse/SPIGOT-6337

[Trigary]

This is a vanilla issue. The forgiveDeadPlayers gamerule has nothing to do with it: it's just universalAnger.

Also worth noting, as also noted in Discord, that looking at the enderman's face results in attacks. So the enderman must be hit in the legs.

[Prof-Bloodstone]

I think neither of us tested if just setting one of those game rules is enough. But I did try it on vanilla and it worked fine, so seems to be bukkit issue.

[Trigary]

I tested it with just one gamerule.

I did try this on vanilla and it did not work; the same issue was present. This issue is also reported on the MC bug tracker: https://bugs.mojang.com/browse/MC-195278

[Prof-Bloodstone]

Tested again and the issue is indeed present in vanilla. I have no idea how I tested it yesterday, must have missed something.

[yannicklamprecht]

The bug is likely present in the check method of the reset anger goal of the enderman.

[Trigary]

The reset anger goal is used by multiple entities, yet they seem to work fine.