I found a small bug regarding the named sections. Here are the steps to reproduce it:
- create a box and a joined curve
- set the box and one part of the curve (cmd+shift) as a named selection
- explode the curve - this leads the named selection to have only 1 instead of 2 items
Undoeverything (cmd+z) and your curve is joined back together, but the named selection keeps having only 1 item, although it should have two again…
Hope this helps.