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Format8bppIndexed Doesn't work for alpha color values.
When you save a png in this format using a pallet, the alpha value is ignored.
This works fine on windows .net and png supports it.
This appears to be a System.Drawing issue, unrelated to MonoMac/Xamarin.Mac.
I've moved it to the correct product.
Apologies on the long delay in response. This bug was misfiled and overlooked.