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Now I first noticed this when I was in-flight and shut down just #2 engine. I landed and shut them all off and the #2 prop was solid. I took off again and alternately shut down #1 and #2 engine, to see if it might be windmilling and just an erratic graphic with my old V card. When I shut #1 down it was solid and not windmilling. When I shut down #2 it was again transparent.
I was able to duplicate it and am therefore calling it a bug, although minor, a tiny bug all the same.
Note this was running 2.19.1