Bug with AMS continue from another feeder?

If more than one AMS slot uses the same material, say slot 1 and 2, and the first slot chosen runs out, it will continue from the other slot great but if I now reload the slot that went empty, the machine seems to stop using the secondary slot and goes back to the first one, wasting filament in the switch !

Saw this behavior a few times. Anyone else experience this too? Seems like a bug.

P.S. sad story I dropped a 1kg cardboard spool when I was transferring it to a plastic spool and it became a tangled mess. I cut it into a bunch of sections.