I noticed this since I got my career extension trainer, that indeed the first drop when a player turns 33 is a double drop. I didn't track it precisely, but it's been about 5 out of 5 so far, today another case.
I'm aware that it's random and that it can lead to outliers with bad luck, but it's starting to look like a pattern. Others have noticed too
(260943.1)Maybe it's worth looking into by the BB's?