SSR not correctly storing session between pages after successful login

[Cocolin67]

Bug report

• I confirm this is a bug with Supabase, not with my own application.
• I confirm I have searched the Docs, GitHub Discussions, and Discord.

Describe the bug

When a user logs in on my application, data correctly sends out data.user and data.sesssion. However, after switching pages, data.session changes to NULL. I tried all methods, asked the supabot assistant for help, changed cookies options and still doesn't store well... I'm hoping this is a bug because I'm struggling hard X)

To Reproduce

On a NextJS 15 application, with Pages Router, install SSR by following the official guide for setting up SSR with Auth on the official Supabase website. Now, log on to an account and log the data.session between pages. After the initial login, you should get all data (data.user and data.session) and after that, data.user should still be stored and data.session should be empty.

Expected behavior

Data.session should store between pages and actions.

System information

• OS: Windows 11
• Browser: Firefox
• "@supabase/supabase-js": "^2.47.8"
• Node version : v21.6.2