Was placing fences in a line. The baby chicken walked through as I clicked. I clicked directly on chicken. The center of the fence did not appear but the arms did. These arms disappeared once I removed the connecting fence to the left. The fence was not used and I could walk through the space where the fence should have been placed
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Did the fences revert back to normal after rejoining?

The fences reverted to normal after replacing yes. Also a few days after Posted the original report this happened again with a stonecutter and a villager. The stonecutter disappeared from both my inventory and the ground but after I opened my inventory the cutter was back and usable.

Please check if that's still an issue for you in the latest 1.14 (pre-)release.

I've experienced the same issue in 1.15.2 and was able reproduce it in 20w19a.
Reproducing it is a bit tricky, as you have to place the fence right in the moment when a chicken walks on the block where it should be placed.
What worked best for me was building a small space (e.g. a 3x3 area enclosed by fences), then placing a few chickens in it and then trying to place a fence in a corner block surrounded by chickens.

Duplicate of MC-132428.
Thank you for your report!
We're tracking this issue in MC-132428, so this ticket is being resolved and linked as a duplicate.
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