Hello,
I noticed some features I had created in ArcGIS Pro were not showing up in my AGOL dashboard. I tried a couple things and noticed that when I opened the Web Map in Map Viewer Classic they were there

but when viewed in Map Viewer they were no longer visible.

They are visible and editable, etc in ArcGIS Pro. The gap is due to some old digitizing where the lines were run up to the edge extents of a global map and not edge matched. I did edge match the line in question.
I'd be interested in hearing if anyone else has run into such a strange behavior.
Thanks in advance.
GR