Ah, ok, that bug isn't *quite* as bad as I thought then...
As long as I make sure my surfaces have equal width and height, AND I make sure they will never be clipped, then the bug should never occur on any device.
(Excuse me for repeating the same basic thing over and over... it's just that this is an extremely important thing for me to understand properly, as it really makes the decision for me about what the future of my current project is).
Fortunately, those are conditions I can work around in my current project, so I can actually go ahead with 2.04. Thank you Johan