Neither have I. I agree with fluor that it does not show the 15-min break in between and my guess is that some ladies prefer a more compact schedule...I have been "rushed out" a few times, about 10mins earlier or they started cleaning in that time.
Never really bothered me though
Being rushed out used to bother me, so I came up with strategies. For example, if I saw that 11 a.m. to 12 p.m. was already booked, I’d assume the guy had booked one hour, not 45 minutes, and that they had added a 15-minute break. So I’d book at 12:15 p.m. instead. It doesn’t help if the next guy books at 1:15 p.m. though lol. But that’s good etiquette.
Then I had the idea of booking at 12:30 p.m., waiting for another guy to book at 1:30 p.m., then cancelling my appointment and rebooking at 12:15 p.m.

But one time they added the 15-minute thing in the meantime, so they ended up with a 30-minute break instead of 15... That didn’t seem fair, so I stopped doing that. Also, it was too much work...
Now I just try to book the last session of their shift lol
I don’t think that’s what ladies prefer, tbh, because as I said, the 15-minute break only gets added if an admin does it manually, or at least that’s my strong assumption. I’ve definitely had girls say their schedule was full with no breaks in between, hinting that the session might finish early... I usually just tipped less if the session ended early; at least that didn’t feel like I was “losing” something lol