Apple Watch: Shortcuts not working

There are two issues reported by a user (#4667298-zd). Creating this bug report to track the progress, even though we've also seen this and experienced the same on Apple's first-party apps.

**Issue 1**

They keep getting an `Allow "shortcut name" to run actions from "(null)" confirmation`.

**Issue 2**

Sleep timer action fails: `"Could not run 'set sleep timer'. This action encountered a problem while running on your iPhone"`.

User notes that, on their phone, the Set Sleep Timer action causes the app to open. They’re wondering if this is connected to the shortcut failing in the watch.

iPhone XS with iOS 15.1
Apple Watch 5 with watchOS 8.3 (19S55)
More info: #p1643942220812459-slack

No file or test is named. Start by reproducing both Shortcut failures with an iPhone XS on iOS 15.1 and Apple Watch 5 on watchOS 8.3, then use the linked user report and Slack reference to trace the behavior. Done means the watch no longer shows the unexpected confirmation and the Set Sleep Timer action runs successfully.

Written by the indexing model from the issue text.