Just my 2 cents: I don’t count in which proportions this is happening but very often, when trying to setup a flight at Hawaii with live weather, the icon on the top right showing the kind of weather is depicting a storm over a gray background, but once loaded and ready to fly it is live weather as expected (no storms).
However, it is very had to diagnose this kind of problem without proper metrics and I’d suggest you also support this with your vote:
Debuging log - Self-Service / Wishlist - Microsoft Flight Simulator Forums