Shopify Partner Dashboard showing deprecated API warning that doesn't exist in my code

I’m getting a persistent warning in my Partner Dashboard for a deprecated WebhookSubscription.privateMetafieldNamespaces endpoint, but I’ve searched my entire codebase and this endpoint isn’t being called anywhere.

Details:

  • Public app on Shopify App Store
  • Warning shows “last detected” daily
  • Thoroughly searched codebase - no references to privateMetafieldNamespaces
  • No third-party libraries making this call

Has anyone experienced deprecated API warnings? How did you track down the actual source?

Looking for debugging strategies or possible causes I might have missed.