I think there is something fundamental that I am missing about publishing tile packages from ArcMap 10.5. I am trying to use a custom basemap. However, I experience the incomplete publishing problem (i.e. levels 15-19 are not fully published) highlighted in this technical article: Problem: Hosted tiled map services do not publish as expected in ArcGIS Online
I made sure that ArcMap uses the extent of data in all layers, so it shouldn't be clipped.
I even try the publish tile option in the item details of the hosted tile layer, but it never actually changes.
What am I missing? Do I need to do something with "Generate Tile Cache" while in ArcMap?