[MC-252383] Mobs not instantly despawning outside of 128 block radius

In the attached image I am in the Nether at Y = 341 which is 213 blocks away from the Bedrock ceiling. The instant despawn radius is 128 which is not working.

I have executed a command to verify that there are mobs loaded

execute as @e run say I am alive and below the bedrock ceiling which is at Y = 128

Many mobs execute this command indicating they are not despawning. And when I use a tp command to one of them it takes me to the lava lake way below the bedrock ceiling.

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Comments 4

user-f2760 2022-06-01T06:07:12Z

Pretty sure that that despawn forcing is horizontal only; additionally, striders are passive mobs, they don't despawn.

apple502j 2022-06-01T06:47:53Z

Hostile mobs do despawn when you are 128 blocks away vertically, but striders are not hostile.

Curtis Phillips 2022-06-01T17:00:23Z

I can understand passive mobs not despawning, but what about Neutral. For Zombified Piglin farms I recall them despawning outside of the radius under normal conditions.

And on a similar note should mobs be SPAWNING outside of the range? Because I can do the /kill command on them and a few moments later the mobs have spawned again way outside of this range.

j_p_smith 2023-10-21T03:28:20Z

I'm not able to reproduce this for any mobs other than striders, even in 1.19 Pre-release 4. Do you remember if any other players were present in the world? If you're still able to reproduce this in 1.20.2 or later, could you attach or provide a link to an affected world?