4.26.2 LandMass splines disappear when selecting

Created two Landmass splines - worked great and as expected - every one after - that the control splines disappear - regardless of if a new layer is created, or duplicating existing landmass. Splines are visible when landmass is unselected - but disappear when selecting. The original two I created remained visible and selectable. Started over, restart engine, new project, new level - and now all landmass splines disappear when selecting - the initial pyramid is placed - effects can be applied - the landmass can be moved around - but splines are not visible - Am I perhaps doing something wrong or is this a potential experimental bug?