Tonight, same thing happened. Had buy zone while waiting for other players to join, I was CT. Player joined, I was human, had a buy zone. Switched to dragon fly, end of round. Next round, no buy zone for CTs. After a few rounds and confirming it wasn't just me, switched map. Next map was fine.

Attaching map for map and time confirmation should that be helpful.

Replying to this thread to show this has happened long before Dragon Fly was added.