You are right, it does log out of discourse if I log out of WP. I edited my comment when I realized that.
about the logout redirect setting, I didn’t find it at first because it was on the user tab and not grouped with the other SSO settings. It was a reason for me believing the patch wasn’t implemented yet! sorry about that.
But I still have the issue of when I am currently logged in WP, and I click on a discourse link, I am not automatically logged in (if I didn’t use the log in button from discourse that uses redirects and transports the SSO payload from one installation to the other. Is this achievable?