I think the problem probably lies with the XCode packaging options rather than the Metal API.There's an option in `Build Settings`->`Compress PNG Files - Packaging` called `Compress PNG Files` which recompresses your PNG files with a custom version of PNGCrush, amongst other things (switching to BGRA IIRC), it premultiplies the alpha.
Columbo
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This issue appears to be fixed with XCode 13. Metal libraries compiled in XCode are now working on iOS 10 for us, so you may want to remove your workaround.