Legacy Mono had incorrect facades for some System.Drawing types. This was an effect of System.Drawing being the implementation assembly and System.Drawing.Primitives/Common being the type forwarders. Due to the Mono SDK bugs many NuGets for MonoAndroid/Xamarin.iOS incorrectly expects the following types to be present in System.Drawing.Common:

• System.Drawing.Color
• System.Drawing.KnownColor
• System.Drawing.Point
• System.Drawing.PointF
• System.Drawing.Rectangle
• System.Drawing.RectangleF
• System.Drawing.Size
• System.Drawing.SizeF

PR #82618 solved a similar problem for mscorlib. We should consider adding the type forwarders from System.Drawing.Common to System.Drawing.Primitives to offer compatibility for MonoAndroid assemblies.