Noticed this as well, players take forever to go up one stat, then one month later it's dropped again.
Developing youth used to be enjoyable, but like everything else in this game it's now a chore!.
It's a shame I gave FM 2023 a download on the game pass and I'm enjoying it, but small things make me miss fm2006,07,08,12,13, I actually bought them.
This is one of these things were they have tried to make it more realistic (or less gamey) so you can't develop a lot of youngsters, like the change to be able to sign loads of 16 year olds for low cost. The problem is people found that fun so why remove it?, Games are meant to be fun!.