I haven't seen a problem with lane or take numbering, either; most recent take is always at the top, and always the highest numbered lane, though take numbers in clips start over when a new recording is made after stopping the transport.
The one case in which you will get "pre-slicing" is when stopping the transport part way into the next take (whether looping or by manually recording another pass). The previous take(s) will get split at the end of the partial take, and the overlapping part of the previous take will be muted. All you have to do is delete that last partial take lane (assuming you don't want it), and swipe through the previous clip with the comp tool to "heal" the split(s), and unmute the previously muted section.