Zombie Pigmen Stop Tracking Eggs After Taking Damage

I'm working on expanding my gold farm and the zombie pigmen now fall several times before dying. After each fall they should track a new set of turtle eggs at their  new y-value. But after taking fall damage, the zombie pigmen no longer track turtle eggs. They just sit there. However if I save  and quite then relaunch world they correctly start tracking the eggs again. 

Gold Farm is in Nether Wastes above Nether Ceilling

I have a video of this but i can't upload it cause file size limit. If a mojang guy is reading this i guess u could send me an email and i can send the video

 

i opened a backup the same world in 1.16.1 release and it seems to have the same problem. Im starting to think this might not be a bug. I really hope it is a bug tho, cause im going to have to redesign my gold farm otherwise.