Well… here is what I just found. If you put the mask on the layer BEFORE you send it to Mask AI, it comes back as an editable mask. It is exactly what it use to do. I think that what Mask AI SHOULD be doing is duplicate the layer, add a mask than go to the plugin. If this doesn’t get fixed in an update, I will simply create an action to do just that!
Try it. See if you get the same results