My research finished for Basic Farming technology. I built a Compost, the Compost is in full use, fully filled up, etc.
My research just finished Basic farming Technology for a second time. The popup happened, all the items had the explanation point next to them a second time, and all the dupes celebrated. Everything happened as if it had just finished being researched for the first time.
I don't think I can reproduce this, it's only ever happened once.
I reloaded the save and it happened again.