I've seen it, its just very small.
Check the players potential on his player card in the beginning of the season, then sim till the end of the year. The line at the bottom about his potential usually changes, which means his potential changed.
But I've rarely seen a A fall to a B in a season, once. Most of the time its a middle A falling to a low A, or vice versa. I didn't see any big jumps in a season when I was testing.

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