Getting the same error. Assuming this will get fixed in a couple of days.

@iMoritz and @arturstp this works fine for me. Remember to have the correct targets set for the font. Text("Title") .font(.custom("YOUR-FONT-FILE", size: 18))

I am also experiencing this. I find that it especially is a problem on the accessories/widgets for watch. I am showing an image inside a ProgressView and sometimes with a circular background color. When the user has a color selected on the watch face, it then forces the accessory/widget to be filled out with the selected color. Making the image unusable when the user has the said circular background color.