Solid Element Ooerations are not considered in the floor plan representation. If you want a correct representation you should do split the wall into two walls, one is the wall underneath the stair before the cut line and it has to be put on a hidden layer, the other wall which is over the cut line of the stair should be put on a visible layer.
AC 19 and AC21 latest hotfix
Win 10 Pro 64bit
Double XEON 14 CORES (tot 28 physical cores)
32GB RAM - SSD 256GB - Nvidia Quadro K620
Display DELL 25'' 2560x1440
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