I'm having the same problem described here
Essentially, I have a form that allows users to submit support messages. It's a client component, that imports a server action from another file. That action is what persists the message. But I'm consistently getting the following error, but only in prod.
Error: Failed to find Server Action "bc81a9de752a2e5bccc63eff66907dd50f7a6aac". This request might be from an older or newer deployment. Original error: Cannot read properties of undefined (reading 'workers')
I'm on next 15.0 and deploying on fly.io