What I did:
1. Put a tamed and saddled horse on a lead
2. Open a chest, and exchange the remaining lead for a stack of fences
3. Place one fence post (not next to anything else)
4. While still holding the remaining fences, right-click the post to attach the lead
5. Walk around the post and observe that the knot is only visible from the southeast

Also, the lead terminates at a point in the air above the post, not on the post, though that's already been reported as MC-49361.

The screenshots are with the John Smith Legacy resource pack, but both bugs are also present with the default pack.