Same here. It's caused by the sshd daemon being split into multiple binaries. In fact, the commit which introduced the change mentions this explicitly:

> NB. if you're updating via source, please restart sshd after installing, otherwise you run the risk of locking yourself out.

https://github.com/openssh/openssh-portable/commit/03e3de416...

Edit: Already reported at https://gitlab.archlinux.org/archlinux/packaging/packages/op...