I believe this is an issue if you are deploying to earlier than watchOS 6. Bumping the watchOS deployment target to 6.0 made this go away. This isn't a long-term solution for us, but might be useful for others.
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I've filed FB8207488 with a sample project. This is easily reproducible by creating a new "iOS App with Watch app" project and dropping the watchOS deployment target to 5.3.