If you max out a trade with a villager enough so that it restocks twice, something the game reminds you is the max when you try to trade again, you can glitch it so the villager still trade. It's simple: unload the chunk the villager is in, by either flying away, walking really far, or if you're on a server teleport away. I have not tested if it works with the nether portal. I have only tested it with a render distance of 11, I do not know if it works on lower render distances.
MC-159605
Villagers can restock more than 2x a day
Resolved
Duplicate
0
Thank you for your report!
We're actually already tracking this issue in MC-157136, so I resolved and linked this ticket as a duplicate.
However, that ticket has already been resolved. Depending on the resolution, that can mean that it either will be fixed in the next version, or that it is not considered a bug and won't be fixed.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.