The short answer: DJI is treating the MA2 like "end of support/end of life". I have the same firmware versions as you, and it doesn't seem to matter which version of the DJI app is running. My biggest complaint is the occasional "fail to launch"...
Icing is a huge concern. On a drone it just adds weight but it can add up.
Don't fly through clouds.
Flying near waterfalls is where you could find freezing mist. That can accumulate very fast.