Several people are reporting problems with many different apps, including just smart lighting, not being able to find devices that were listed on the previous screen in the same smartapp. Even Zwave repair is failing to find known devices for some people. Screenshots are being posted, and it doesn’t look like any kind of procedural error on the user side.
I would definitely report it to support@smartthings.com with your screenshots. I don’t think this has anything to do with a specific integration.