Client-server desync when attaching a lead to a fence while holding a block

The bug

When attaching a lead to a fence while holding fences, the client places the fence that is held for a short time, causing a desync with the server.

To reproduce

1. Place a fence
2. Put some more fences in your hotbar
3. Leash an entity
4. Select the fences
5. Attach the lead to the fence
   → The fences stack appears to be decreased, and neighbouring fences try to connect to where the fence appeared for a split second

Video

Minecraft 1.14.4 2019-08-13 18-59-01.mp4

Original description

tying a lead to a fence while holding the same kind of fence will use the fence without placing it. right clicking next to a fence doing this can create a glitched fence where it's connected to nothing