The Bug:

Trading with villagers or wandering traders while holding spawn eggs doesn't play the hand animation.

Please note that if you were to attempt to trade with a villager while holding a villager spawn egg, a baby villager would be summoned so in order to reproduce this issue with villagers, use any spawn egg other than villagers.

Steps to Reproduce:

1. Summon a villager and assign it a job or a wandering trader.
2. Obtain a pig spawn egg and hold it in your hand.
3. Trade with the villager or wandering trader and as you do this, watch your hand closely.
4. Take note as to whether or not trading with villagers or wandering traders while holding spawn eggs plays the hand animation.

Observed Behavior:

The hand animation doesn't play.

Expected Behavior:

The hand animation would play.