I would definitely call Esri Support or put a support ticket in to get a quick reply to this issue.
Just another question. Did you install any other patches?
ArcGIS Desktop 10.6.1 v10.6.9270
ArcGIS Desktop 10.6.1 Raster Patch (ArcGIS-1061-DT-R-Patch)
I may have also installed ArcGIS Coordinate Systems Data but cannot recall if that was before or after I tested the issue.
You can run this tool Patch Finder for ArcGIS to get a list of installed patches on your system to confirm it is installed.