Hi, I was unable to login to my old account so I made a new one. The villagers are not on a chunk border. I built two different villager trading halls from the following links. https://www.youtube.com/watch?v=RDFxhpQkqww&t=371s and https://www.youtube.com/watch?v=tN2v_cPMui0&t=843s
The way to reproduce this is either using the world download in the second link on a server with the snapshot outside of spawn chunks. Or by placing an observer with a string in front of it and a villager touching the string. The observer then needs to be connected with a t flip flop to the trapdoor/piston that you want to be toggled.
When I login the villager seems to load in and trigger the string which sends the signal through the observer which toggles the trapdoor/piston. Here are some snapshots of it on the server I am on.
Oh yes it is just a visual glitch. Thank you for helping!
Okay sorry I found a bug and I didn't really know how to report it properly. I tried to follow instructions.
The key to reproducing this I believe is having it completely outside spawn chunks so that it is not loaded.