This had been a delightful harvest, but things couldn't always be good.
At that moment, there was some intelligence Luke had gleaned after the Battle of New York which made things tricky for him — like Loki's scepter and the Tesseract.
He had tried putting Loki's scepter into his inventory out of habit.
The system liked to eat mysterious items, so it was best to let the system have a look at whatever was rare.
A scepter that could mislead and control people and a Tesseract that could open a portal — these two items were clearly mysterious.
The result was that Luke almost collapsed.