Describe the bug

We have a missing cookie rewrite which doesn't work. After some debugging, it seems like the issue is in cookies being wrongly parsed.

Cookies passed to the matcher:
cookies { _ga: 'xxx; codeVariant' }

Cookies from the headers:
cookie: 'xxx; codeVariant=TS; codeStyling=none; _ga_XJ83JQEK7J=xxx; crisp-client%2Fsession%2Fd4cd5bac-6848-4f4d-9a7f-082f5b324b79=xxx; _octo=xxx; sidebar:state=false; cpu_bucket=xxx; preferred_color_mode=xxx; tz=xxx; test=xxx'

This implementation is wrong:

Cookies are semicolon-separated, not comma-separated.

Steps to reproduce

1. Add a rewrite to next.config:
   async rewrites() { return { beforeFiles: [ { source: "/test", destination: "https://github.com", missing: [ { type: "cookie", key: "test", }, ], }, ], }; },

2. Add a cookie test with any value.

3. The rewrite will always pass.

Expected behavior

Rewrite should

@opennextjs/cloudflare version

1.0.4

Wrangler version

4.17.0

next info output

N/A

Additional context

No response