Yunohost 3.6 and Nextcloud 15 -> can't logout

Hello,

Just installed Yunohost 3.6 and Nextcloud 15, and I encounter a logout issue from Nextclou,d explained here : https://github.com/YunoHost-Apps/nextcloud_ynh/issues/106

I’ve been running Yunohost (some version I don’t remember) and Nextcloud 13 for some time now, and I’ve never seen this issue

Would anybody have an idea on how to solve this, because it makes this setup unusable (user 2 can reach the account of user 1 just because user 1 couldn’t disconnect) ?