Vercel Rolling Releases UI error when switching assignment methods

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Problem

I encountered a persistent UI error when configuring Rolling Releases. The error triggers specifically when switching between assignment methods within a newly added stage.

Steps to Reproduce

  1. Navigate to the Rolling Releases configuration (using default settings).
  2. Click on Automatically.
  3. Click on Add Stage.
  4. Change the assignment method to Manually.
  5. Immediately change the assignment method back to Automatically.