I've been doing a nether survival world for the past few days, and finally managed to get a couple Hoglins into a fenced in area. I bred them together a couple times, then killed off the parents for food, leaving the babies to grow up. At this point they were still acting hostile, and were accepting the crimson fungus.
Now the two Hoglins have grown up, but the game won't let me breed them, nor are they hostile to me anymore. I'm not sure what caused this to happen.
They appear to attempt to breed (facing directly into one another) but no baby is made. They are also still afraid of warped fungus.
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I was never able to resolve the issue, though I am unable to test anything involving it anymore, as I ended up losing that world due to a computer hardware failure, leading to a large amount of corrupted files on my PC. If you need, you can continue investigating, but you don't need to hinge it on my response as of now.

I was unable to reproduce in 1.16.4
a) Hoglins take a while to breed, that is intentional
b) Please check that there aren't any other Hoglin repelling blocks around (use spectator mode if necessary)