Xcode 10 GM complication image size doesn't match HIG

I have complication images for the Circular image set. According to https://developer.apple.com/design/human-interface-guidelines/watchos/icons-and-images/complication-images/, the Simple size should be 40x40 for the 44m watch. However, adding a 40x40 image leads to an error on Xcode stating that the image should be 36x36 (the same size as 40mm and 42mm). Which is correct?