Jls

It may be that I am just unlucky, or it may be due to how many librarians I have, but now that I have experienced this bug I seem to be able to reproduce quite easily. Here are the steps I take to reproduce it:
1. Find a librarian
2. Trade with him until he sells an enchanted book (higher the price the better)
3. Refresh his trades
4. Check the enchanted book
5. If the book hasn't changed, go back to step 3.

I can get video of this on multiple villagers if that would help.

Indeed, I regret saying Mojang have been ignoring this issue. I do appreciate the work they are putting in to resolving all of Minecraft's bugs. My comment was merely a reflection of my frustration with this bug, its quite long life, and its unconfirmed status.

I really wish that Mojang would stop ignoring this bug. This is one of the most disappointing things to happen to me in Minecraft in a long while. I spent many, many, MANY hours breeding and trading with librarian villagers in order to get an unbreaking book trade, as well as others. Then, I trade with the villager with unbreaking and his trades update. Fine, that is how it should be, but suddenly the unbreaking 3 book is gone and swapped out for knockback 1? What? Why??? This make absolutely no sense to me.

This isn't just annoying, it is entirely inconsistent. No other villagers, with the possible exception of priests, change what they are selling, only the quantity sold/bought or emerald cost.

I'm not asking for the prices to drop, or for the trades to improve, but only for them to not completely change like this.

The problem is not just a visual one. There may be two bugs here:
1. The leads disappear from the fence post to the mob when I log out and then back in to my server, but
2. The leads actually break and appear on the ground as an item when I leave the area and come back (perhaps on chunk reload?).

This is extremely annoying as it has cost me several mobs. Furthermore, I can't rely on just bringing fence and leads when I go exploring. I have to encase my horse in walls because I just can't rely on the to leads keep my horse there.