I started a new save file yesterday on 1.6 and I am on a Switch. It is first year summer season. I completed the quest and was paid, but my inventory was full and part of the prize was a ticket. I think this is what caused it to loop.
*Steps to reproduce:
1. Take quest (with ticket reward)
2...
I completed Evelyns request to gather leeks for George (she only needed one though). This was in spring year 2. I never received the coffee maker and there's nothing in the LostnFound. I've since 10hearted both npcs and still nothing.