When getting into range of mob spawners that spawn Angry Entities (ie: Wolf, Iron Golem, Zombified Piglin, etc) the attached error is constantly spammed to the output log. This can cause performance issues for both servers and singleplayer.
MC-199684
Output Log is spammed when using Mob Spawners
Resolved
Duplicate
0
Hi there!
This looks like a duplicate of https://bugs.mojang.com/browse/MC-189565, which has actually been marked as Fixed for the first 1.17 snapshot!
We're not quite sure when that will be released, however. Keep an eye on that ticket if you'd like to know when it's fixed.