There are a LOT of corner cases when it comes to blending. Please give me more info about what you're doing and not just the ROM. Further, they may be broken in OpenGL mode, and also may have been fixed since 0.8.3 (I've made a bunch of changes...), so please test with a newer version and make sure which renderer you're using.
mGBA 0.8.3 doesn't fade the dinosaur in the middle (rendered with a sprite):
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