Submitted a report via the Feedback Assistant (FB11859835). What's interesting is things were working fine this morning. I then added the "App Uses Non-Exempt Encryption" key to my info.plist and every build since then has has the issue. Removing the key didn't change things.

Hey Alex, I’m having the same issue as you. Were you ever able to get .onOpenURL working in watchOS? Works fine for me in iOS & shared code. Thanks.