A co-worker was attempting to make a cut to an item in an assembly and the cut would not show. I took the assembly and can reproduce the issue but have also been able to make the cut work. I was wondering if someone could explain why the cut is not working. The first image shows the cut working and the second shows the failure.

I created two configurations, good cut and bad cut and the cuts are labeled at the bottom of the tree. Yes I know the cuts are not fully defined at the present but this is just an investigative action at this point. In playing with the bad cut I have found that if I move the end point of the "vertical" line to the edge of the flight it will usually work, but not always. Can someone explain what is going wrong, or have we found one of those fabled bugs?

SW 2018 SP3.

I had to suppress everything to reduce the file size so you will need to unsuppress all components and make sure the freeze bar is to the bottom.