The Chickens that spawn as part of a Chicken Jockey are no longer spawning with the "IsChickenJockey" tag set to 1b. Instead, the Baby Zombies are simply spawning as generic passengers.
The main issue with this is that it is allowing the jockey chickens to lay eggs, resulting in large clusters of Zombies holding eggs being unable to despawn- similar to what happened in 1.7 when the Chicken Jockeys were first added. I believe this to be the cause of MC-231977.
I have attached an image of the data from a naturally spawning Chicken Jockey that I gathered using the /data command. As you can see, "IsChickenJockey" is set to 0b, and a passenger's data can be found.
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No, MC-229490 is referring to an abundance of them which is a separate issue.
The issue I am referring to is that the chickens that spawn as part of a Chicken Jockey are naturally spawning without the proper NBT data.
Cannot reproduce; chicken jockeys do spawn with the IsChickenJockey tag set to 1b. Maybe this is an occasional occurrence?
Please read the comments in MC-229490 and get back to me
Does MC-229490 describe your issue?