The airliner is exposed to icing at altitude and falls, despite the fact that the effect of icing on the plane is turned off in the settings. Turning on anti-ice does not work - it does not work.
live weather overrides the the visual only setting, for the visual only setting to work you must be using weather pre-sets other than live weather (or posable REX weather too).
anti-icing on the 747-8i dose work for me.
just in case you are mixing up aircraft, the 787-10 has NO working anti-ice yet, and as such if its is cold enough for icing to happen you must set icing to visual only and use weather pre-sets other than live weather.
Once out of the clouds, I’ll switch over to clear weather, and max out the temperature setting (about 60 degrees C at sea level). That should be warm enough to melt off the ice even at 20 or 30K feet after a few minutes, set weather back to Live and be on your way.
But yeah it seems that the last update completely disabled the 747’s anti-ice systems.