I have a feature class with a coded domain "Coltivazione". In image below you can see that is a domain for a field with numeric value.
So I made a symbology based on this field
And finally I publish on ArcGIS Online (using ArcGIS Pro but also with ArcMap). But what I obtain is a template for editing where label is not like domain's description as I can aspect. You can notice using Collector for ArcGIS...
Otherwise, if I publish my feature class without any symbology and set this using Smart mapping, template for editing is exactly as I would expect.
Maybe a little bug?