Holding out an item that a villager wants and throwing it out of your hand or placing it in a lecturn, and presumably other methods, causes the villager to still show it's offers. This seems to not work however with cycling trades, e.g. holding an emerald out to a master librarian, they will cycle once and then stop showing their trades
Linked issues
duplicates 1
Comments 2

Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-166669, which is a report that has not been resolved yet.
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Duplicate ofย MC-166669