Vector Tile Layer - symbology not drawing

[CraigCarsley]

Problem: Vector Tile layer does not display any symbology; only labels

Process:

1. Configure map in ArcGIS Pro, setting label and symbology properties
2. Create vector tile package using ArcGIS Pro geoprocessing tool
3. Share package with ArcGIS Online using geoprocessing tool
4. Publish vector tile package as vector tile layer
5. View vector tile layer in AGO web map and in VT style editor

Result:

P.S. I can't change the basemap in the vector tile style editor. I can only see this gray background (img above).