I’ve noticed this issue from time to time as well, and I’m talking about shows that come overnight (in the UK).
For example, when I looked this morning when I woke up, FBI from 1am was showing in ‘Up Next’ correctly, but FBI International that was on at 2am was not showing. The only way I could access this was from calender view or to search for it. It’s almost as if the episodes have winked out of existence. If it’s not in the upcoming, it should be in the up next section. Either one or the other (unless it has already been marked as watched, which in the case I mentioned it wasn’t.). FBI International did appear eventually in the ‘Up Next’ but only after a 6/7 hour delay.
This doesn’t happen all the time, but far too much for my liking.