Motion 5.2 Missing Image Mask?

I recently noticed (probably coincident with update to 5.2, but not sure) that when I add an Image Mask, I can only see it in the Timeline, not in the layers. In the picture below, you can see the group in both Layers and Timeline, but only in the Timeline does the Mask appear. It's there; you can see the effect of the transparency gradient in the Viewer. Anybody else experiencing this? Anybody have an idea why and/or a suggested solution? Much prefer to work with Layers with Timeline hidden. Thanks for any suggestions.