MC-301649 was recently marked as Working As Intended. The bug report is here: https://bugs.mojang.com/browse/MC/issues/MC-301649
The change, made in 1.21.2, causes many mob search ranges, such as villager iron golem searches, to have large random variations. This causes existing designs for iron farms to be unreliable, and may increase lag for farms that rely on spacing to mitigate entity searches, such as bartering farms.
This could be fixed by creating a separate, fixed attribute for these search ranges to use instead of FOLLOW_RANGE, or by removing the randomness from the attribute. Alternatively, this randomness being reduced somewhat would still be helpful.
I cannot see a drawback to removing the randomness on these particular sensors. In normal gameplay the ~3 block differences between the maximum and minimum follow range will hardly be noticed, but it has large negative impacts for technical applications.
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