Hi, You are right, I have no special reason to use P2D in this case, and I can also use pixels[].
I just wanted to report bug (maybe I'm in wrong category, but I din't found any bug-report category)
I don't think this is some importaint issue, but maybe it points out some more deep problem (if there is any) concerning sychronization bewneen GPU based buffers and processing.
Anyway, thanks for answers.