it doesn't happen super often if you know how to do it (and therefore how to avoid it), but it isn't very hard to do by accident. i have tested it several times to be sure, but only in campaign mode. if you start repeat crafting anything (either blocks or components) and then switch to crafting another thing from the same fabricator or factory without first canceling the thing being made, the fabricator or factory will take in chunks and components without actually making anything. it will stop if you press cancel. it's not really a big issue, but it can cost you a lot of time and money if you let your guard down.