The answer
Yes, if the wrong deployment or branch is selected. Confirm both the intended code revision and environment before creating the release that applies the configuration.
Why is redeployment necessary after changing production environment variables?
Can a redeployment use an unintended source revision while applying new settings?
More FAQs in Why is redeployment necessary after changing production environment variables?
No. Vercel applies environment-variable changes to new deployments. Create the intended deployment and verify it is serving traffic before assuming the updated value is active.
An older deployment may retain earlier configuration that no longer works or should no longer be used. Review configuration compatibility before directing users back to it.
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