Fletcher won't trade tripwire hook for emerald

I have a cured zombie villager fletcher in my base who says he'll take 1 tripwire hook for an emerald, but won't make the trade when I have one in my inventory.

Steps to Reproduce:

1. Obtain 8 tripwire hooks
2. Place a tripwire hook while facing east, west, or south
3. Break and pick up the tripwire hook
4. Try to trade the tripwire hooks with a fletcher villager

Observed Results:
The fletcher won't accept the tripwire hooks.

Expected Results:
The fletcher should accept the tripwire hooks.