A split shift is two shifts, not one with a gap in it
Write a lunch and an evening on the same person on the same day and Rotaaa keeps them apart: each has its own times, its own break and its own job role, and the day adds up to what was actually worked. A shift finishing at 17:00 and one starting at 17:00 are not treated as a clash, so the split goes in while a real double-booking is still refused outright.