In server, there are two ways to get cookies. First, reading cookies from cookies() function. And another way is reading cookies in header from headers() function. But I found cookies in headers() work sort of differently between general server request and server action reqeust.

In general server request, headers().get('cookie') returns values barely regardless of whether each value is encoded or not. However in server action request, headers().get('cookie') returns all values as encoded. It's totally the same code but behave differently when it's be excuted.

https://github.com/vercel/next.js/issues/77022