GPU bitmap rendering is broken with AIR 15 beta simulator. Should I trust the app?

See the image below.

When running the app on Flash Builder 4.7 simulator, some of the bitmaps break. Only parts of bitmaps are broken, and the way they are broken is different each time they are redrawn (not each frame though). I haven't encountered similar problems with previous AIR versions, not even beta versions and the strangest thing is, that bitmaps are not broken on Android (I have to test with iOS).

I have this problem with two different PCs having different GPUs. I guess this is related to how bitmaps are sent to GPU? Anyone have any idea wheter I should trust the beta build for production or not. I have used previous betas without any issues.