I started noticing it yesterday, before today's changes.
*EDIT* 16:40 not 15:40
As an example, here's a screenshot from around 2022-09-23 16:40 game time:

And here's another at the next tick, around 2022-09-23 16:50 game time:

All characters gained 1 AP (2 AP for one that was outside), but no MP.
For one of them, Peter Coleman, I can say with certainty that they should have gained 5 more MP, in about 5 hours.