I don’t have a high sample size, but me and Mrs Whamy have noticed an issue when there are animal pens around. If we have one out, she sees me bouncing all over the place and my position doesn’t update accurately for her as I’m moving. As soon as the animal pen is gone there’s none of those issues.
Weirdly this wasn’t a problem when we were running co-op, it only happens on a server.
We’ve tested it multiple times, and as soon as I put down the animal taming pen, of any size or type, she starts to get graphical issues.