I may now call myself a Hexpert.
I found a bug. If you already have a second burger then try to get another one the drone will still come. You can take the burger (which I did the first time) and order another. If you leave the screen the burger will float in the same position for a few screens. When I got to the restaurant the burger reappeared. I was able to place the burger I had and collect the floating burger.
And having too many items causes them to stack up on top of each other in the last item slot position.
So I've 100% good ending the game. You need a restart button at the end where it asks about Moose off mode.