[1.20.1] Villagers allow themselves to be scammed with mote trading

[JoshuaCF]

Description

Villagers allow trading for less than what the asking price is when doing trades with motes.

Reproducing

Set up a mote nexus and have a mote with only a single item in the stack of a type a villager wishes to buy.
Use the "Trade" spell to initiate a trade offering a list containing the aforementioned mote. Ensure the villager actually wants more than 1 of the item, but the mote only contains 1. It does not matter if the slot is targeted manually or automatically determined.
The trade will go through, providing the villager with experience and leaving a mote on the stack that's the result of the trade.

Expected Behavior

Villagers reject trades which offer fewer items than demanded, perhaps returning null.

Behavior observed on version 0.3.1-821cc54, in the hexxy4 modpack. This seems to correspond to commit 821cc54.

[JoshuaCF]

This bug is also observable when performing trades with a number of items that is not a multiple of the requested count, e.g. the villager wants 10 clay balls, you trade with a mote containing 11, then two trades will be performed rather than the expected 1 trade.