Grey out visuals while loading data

It's very important for users to know when data has been refreshed, following a selection they made. In August 2018 Server version, it seems that the spinner in the upper left corner of each visual only works sometimes, meaning often users have no idea whether the visual has new data or not. At the very least, the spinner should be fixed. But better still would be to grey out the visuals until the new data has loaded.

Apologies if I've missed something obvious. Many thanks to the great Power BI community!