Hardcore Stumping Transparency Issue
Created by: WesCook
This one is easier to show than to explain.
The bottom block is a stump. I'd noticed some quirky behavior with the transparency on the ground, but up in the air with clouds it's even more obvious.
I should also note that stumps don't respect Hardcore Lumberjack, and will still drop bark (I can submit as a separate bug report if you'd prefer).