Hello Vercel Team,

I am experiencing an issue with a server action.

In my site's header, users can subscribe to a newsletter using the "Inscris-Toi" button. While this works perfectly on the homepage (https://adrienbailliard.com), the action fails to trigger on the 404 page (https://adrienbailliard.com/404).

Adrien Bailliard

Adrien Bailliard - L'ingénierie des systèmes d'élite

Automatise comme le Top 1% avec Auto Monday. Reçois chaque lundi les systèmes qui libèrent ton temps, dans ta boîte mail.

This issue only occurs in production on Vercel; I cannot reproduce it in my local production build.

Here is a minimal repo to reproduce the issue: https://github.com/adrienbailliard/vercel-server-action-issue.

What should I do to fix this?

Thanks!