Accidentally picked up a factory with a full inventory, and I emptied some junk out. Going back to pick up the factory building off the ground, I couldn't find it. Not sure if this is a factorissimo bug or a factorio issue, but thought I would say something

I don't know exactly what happens there, but occasionally the factory item does not spawn. No idea what causes this. You can use the /give-lost-factory-buildings command to get your factory building back.

This happens to me all the time. If I break a factory with a full inventory, it will give me the standard gui error about not being able to insert into inventory. But the factory will just disappear.

Also, this will happen even if you have one or more spare slots on your toolbar. It only checks and tries to insert into your inventory space.