i don't know i'd frame it as such. stamina declines intentionally in the off season, the idea being lazy college students may spend too much time on the couch without coaching riding their *****.
there WAS a glitch where after stamina dropped, lets say from 91 red on a 92 cap, to 87 yellow, the improvement rate was capped at where it was at 91. the rate of improvement didn't reset with the drop. then when the guy dropped to 83 black, it was still improving at the rate of the 91 red would - effectively zero. this was supposedly fixed, but, maybe it wasn't. there was definitely an attempt to fix it that had some impact, but i think folks also posted examples where it looked still broken.
the main part people don't like though, the offseason declines, is intentional behavior by the original creator which subsequent game admins have declined to adjust. i am not a big fan of the stamina drop, its super annoying, but i see the value in it. high stamina is basically broken, its so powerful, and adjusting stamina offseason declines by itself would have unintended effects, making elite players even more elite, and making press more powerful. making press more powerful in particular was considered dangerous by seble. i'm not saying i agree, but i do think its more of a situation where coaches dislike an intentional design decision which game admins declined to adjust, more so than a bug they are too lazy to fix.
IMO they should take this out and drop stamina gen across the board by about 2 points to compensate, and call it a day, but i am not holding my breath.