Since updating my server to 20w17a, my enderman XP farm has been giving very very low rates, as in 5-10 endermen spawning every minute. before this, it has been about 80-100. Although these are rough estimates, it is clear to see, that the endermen are spawning less frequently. I've been reading the patch notes, and it says nothing about endermen spawn rate being reduced in the end, so I do believe this is a bug. I've changed nothing, and compared 2 identical builds in a creative world to test, and the 20w17a is significantly slower.
To reproduce
1. build an enderman farm of any design
2. compare spawn rates of enderman between 20w16a and below and 20w17a
although pictures arent much good, i have a picture of 20w16a and 17a to compare
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is duplicated by 1
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Issue seems to persist in 20w19a. Spawn rates for mobs have increased slightly, however it is still not the same as in 20w16a. Tested in both an enderman farm, and a general mob farm. World updated to 20w19a created in 20w17a show no problems. Only affects worlds created before 20w17a.
Issue is still persistent, I can't say whether the apparent "fix" has yielded anything, still very poor spawn rates.
Seems to only affects worlds that were updated to 20w17a. Making a new world and building an enderman farm yields expected rates.