Fully updated Fedora 30
First few boots it worked fine, but now the login keyring isn’t getting unlocked automatically. It is also interesting that if Déjà Dup fails even one time because it can’t unlock the ssh key, it will fail any next backups, since it thinks that the directory it backs up to is the backup directory of an another computer.
I tried some things unsuccessfully: trying to inject the password to gnome-keyring-daemon and turning off automatic login (single-user, disk encrypted, auto-login on normally).
Edit: apparently after next boot the keyring couldn’t even be unlocked manually (same issue before last Fedora reinstall, but then messed around with nextcloud remembering login and couldn’t make a new one what could be unlocked), after deleting it, logging out and back in I found myself a new Login keyring. So I guess a workaround to when your Login keyring stops unlocking by itself is to before reboot unlock it manually, back everything in it up, delete it and log out, log in.
Though… it now seems to happen every 3-5 reboots. Don’t know the cause. I am suspecting, that it is Déjà Dup.