So heres the thing. Not sure if it is a bug, or it is an intended action.
Ive found, that reinforcments transporters, if find an opponent in a dropping area, doesnt drop units, but instead they hover and shoot everything around, can be pretty imba, especially on small maps, when someone uses fast worthless reinforcments (like scouts) to get airsupport.
First occurance - my game against UEF player, called high tier reinforcments, trying to lure opponent in trap, almost trapped myself.
Second occurance - 2v2 on blasted rock, when opponent rushed my base and air transporters with single units were attackign my base, instead of just dropping units.
Attaching replays, logs are not really fresh, dunno if u want them. I can simulate such accident with someone, then attach replay+logs if u prefer.
Mb just setting them to hold fire would solve the issue?
Edit:
Just got terrifying vision of usage this bug: just imagine what heappens if someone calls some transports with labs? Insta ghettos over opponents base :/