"Could Not Set Up Cellular" alert after canceling cellular service

Hi! I recently canceled the cellular service add-on for my Apple Watch Series 3 (on watchOS 5.0.1), and ever since then I've been getting an error alert on my lock screen: "Could Not Set Up Cellular: Open the Apple Watch app to finish setting up cellular." I'm getting this alert on approximately a daily basis. In the Apple Watch app's settings on my iPhone X (iOS 12.0), it's showing "Set Up Cellular" as I would expect to see; it's just this frequent error alert that is the problem. I don't want to (re-)set up cellular at all, so I'm not sure why my iPhone seems to think I do.

Any ideas on how to get this error alert to stop appearing? I obviously canceled cellular service intentionally and don't want to set it up again. It's not clear why the iPhone appears to still be trying to.

Thanks!