EDIT: This glitch was already reported,
so it is no longer relevant.

This was originally a different glitch,
but then i realized it wasn't a glitch after all.

However, when going to take a picture,
I placed a crimson fence on a runaway Piglin,
and the other nearby fences connected
despite the middle not actually being there.
I'm not sure how many different fences
(or mobs) this works with, but i just thought
i should probably report it.

Reenacting this is simple:
Enclose a Piglin in a 1x2 area of fence, place anything that repels them at one side, and keep clicking with a fence until you get something like the image below.

Keep up the good work!