List of steps to reproduce (step by step, including full links if applicable):
0. Make sure your account have ipblock-exempt permission in zhwiki.
- Log in on zhwiki with proxy.
- Visit ruwiki.
What happens?:
You has been log out, and lost your session cookie.
What should have happened instead?:
You are still login.
Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc.: