Hi,
We noticed a behaviour/bug in MapImageLayer Sublayer rendering.
We have some polygons with relatively complex symbology:

When we set an opacity to that layer, and at the same have a popupTemplate setup, then when we click on the map, it "downgrades" the symbology to a simple fill (and it stays downgraded until you reload the app).

Simple code taken out of the API sandbox:

If I don't set any opacity, then it works fine. If I don't set any popup it works fine too, although It seems to me the issue is linked to the opacity (?).