Exactly what the title says. I connected leads between two fences, left the area for a bit, and when I came back one of them had disappeared and there was no connection.

Immediately after connecting the leads:

After flying away to unload chunks and coming back:

Also, this seems to happen with other fence types:

Also, I'm not sure if this is a bug, but trying to connect a lead between to fences vertically won't render the rope:

Here's my log: https://pastebin.com/FaqcMGpS

Hello! Quark's moved to 1.18 now-- unfortunately, this means that (unless your bug is critical and/or game-breaking), we're closing support for issues filed for versions prior to it (e.g. Quark on 1.16).

If your issue still occurs on 1.18, or if your issue happens to be rather critical (e.g. consistently crashing the game with no other mods present), please leave another note or open a new issue. Thanks for your cooperation!

Both issues are reproducible in 1.16.5 r2.4-311