looks like “reflected” subd’s still need some love 
thanks for having a look at those issues that still exist in Feb. 2026 - see this topic
@pierrec - are you the right person to look at this ?
there is another issue
vertex survives deleted edge
draw a torus and add _reflect in x and y
delete an edgeloop
the vertices at the symmetry-plane survive:
subd_reflect_deleteEdgeLoop.3dm (3.6 MB)