I have noticed recently that if I hit “again” on a new card so it is still in learning phase (with learn ahead set to 0 and first step as 25) that it doesn’t show up for 25 min, however if I create a filtered deck that includes that card, it will be due immediately. I’ve tested this and its reproducible. I don’t know if this was intentional or not so I wanted to bring it to your attention.
I would think ideally if a card is due in 25 min and you pull it into a filtered deck, it should still wait the 25 min before being due buy perhaps there are limitations