[MC-214754] Villagers decrease prices when players saparate trade into multiple times

How to reproduce:

Set time to 18000(midnight) to stop resupply
Summon two villagers (Villager A and Villager B) and turn them into cartographers
Buy 10 empty maps from Villager A
Buy 5 empty maps from Villager B (and close the trading interface)
Buy 5 empty maps from Villager B again **(and close the trading interface).
Villager A continues to sell empty maps for 7 emeralds, while Villager B decreases the price to 6 emeralds.

I think this behavior is inconsistent.

Similar problem happens to other kind of villager. Unlocking of trades seems not relevant.

Comments 2

Cannot reproduce, to me it doesn't make any difference whether I split this into two separate trades or not, I get the same discount either way.

Thanks for your comment. Do both villager sell a map for 6 emeralds?

I wonder if the discount is a bug.