This has probably been happening since the year dot, but when you have a mixture of small and medium stands in a terminal and similarly, small and medium check-in desks in the check-in hall then the game seems to prioritise allocating medium flights to the small check-in desks.
This causes issues with small flight check-in, as they don’t tend to be pushed over to the vacant medium desks if a small check-in desk isn’t available.
This may cause issues when I switch the baggage handling system on in my airport in The Great Baggage Experiment
Is it worth a bug report so the devs can have a look at it?