Hello,
Since the last AGO updated, we noticed that the Zone Lookup configuration for an existing app is no longer able to reference the webmap layers to display in the results. I am including an image with the message I am receiving. The app is defaulting and displaying all layers in the results panel and I am unable to choose which layers I want to include.
I can't reproduce with a test map. Can you provide more info about the types of layers in your web map? The "For a Zone" option requires a polygon layer.