Apple Watch notifications showing with a full-screen icon
iOS 10 introduced some additional notification features, such as image attachments. Pushover for iPhone uses this to show per-application icons, in addition to the standard Pushover icon. Our Apple Watch app for watchOS 3 has a dynamic notification interface that can show these icons as well. However, if the Pushover application is not installed on your Apple Watch, you will see the per-application icon as a full-screen image. To resolve this problem, you need to have the Pushover app installed on your watch.
If you still see these full-screen icons with the Pushover watchOS app installed, you may need to reinstall it. To do this, open the Watch app on your phone, scroll down to Pushover, then toggle Show App on Apple Watch to Off, then toggle it again to On to reinstall it.
Update: There appears to be a bug in watchOS 7 that is causing our custom notification handler not to run, which results in the large icon appearing even when our watchOS application is installed. We are awaiting a fix in a future watchOS update.