Every single villangers restock their trade, price will increase, should is villangers will give you discount if you keep trading with him,
I try one villanger alone to make sure, and right, one villanger will increase their price
and after that I try every sigle villanger i can trade in realms, their activities as usual, they will out to meeting, make a baby, and restock their item.
and yeah, after I trade, they will increase the price. even though I'm not hit them, wake him up if they sleep, i dont remove they job. i protect them from zombie, but the result is same.
I know you have to get hero a the villange, if you want discount, but di minecraft java edition, you will get discount too if you trade with them every day. I hope this is will fix soon in the next update. thank you