Client IP refreshes only on logout

I have SSO enabled and graylog behind reverse proxy.
The problem could be tested on Users page.
1. Open Users page - correct IP displayed for current user
2. Remove all trusted_proxies from graylog config and restart graylog
3. Users page still shows old user IP (but should be proxy ip)
4. Click "Log out"
5. User logs in automaticaly (thanks to SSO plugin)
6. Now proxy IP displayed as client ip for relogged user.
7. Return trusted proxies to config and restart graylog.
8. Again correct client IP will be displayed only after relogging
## Your Environment
- Graylog Version: 2.1.0-beta3 snapshot