not sure if this ever got made clear - you CAN loop back to sample start, rather than slice start, but it requires a different approach (Slices OFF in playback setup, Slices ON in Trig Mode) - It’s a combination of mine and JSZ’s responses above.
I have been revisiting the method today, for other purposes - see Preview the loop point/end of long sample in a hurry - #6 by Clancy
So, did you buy an OT?!