Remember the days? You mean Madden 18? Lol.
But I've heard it referred to as a bug but I'm pretty sure they just finally dug into the gameplans and figured out that teams were only allotted 20 plays per situation. I don't doubt that there was a bug in there where sometimes plays would get called from a different situation but I believe for the most part CPU playcalling was always working as intended, it's just that the gameplans were
really, really bad with how limiting and basic they were.