Edit2: Nope, happened again. Active Sky and ingame different weather. Cloud layer vanished when climbing above.
Active Sky in SMP depiction mode, RWC in external injector mode.
Edit: Upon further investigation, the cloud layer should have not been there in the first place, Active sky reported scattered clouds. In the root x-plane directory there was an additional, older MAXX_metar.rwx file (don't know where that came from). Deleting it i get the proper weather in game.
With the latest version 4.9.4 in combination with Active Sky + RWC, i have the problem that the entire cloud layer vanishes if i go above it.
First picture i am slightly above it, and second picture i moved the camera slightly up, the layer vanishes.
Tested with X-Plane 11.50 beta 10 under vulkan.