Found 2 The first is easy to replicate (Just finish the day between 12:01AM and 7:59AM) the second I actually don't know what causes it
1. If you Conclude day after 12:00AM The Log and Scavenger report is empty.
2. Sometimes when Concluding the day after 12:00AM still before 08:00AM it doesn't jump to 7/8:00AM the same day instead you sleep for between 23 and 32 hours skipping a whole day (If I recall correctly I first encountered this when I crafted weapons then jumped to the shrine to meditate 5 times before hitting Conclude day)