If you got the automatic updates on the bitwarden clients, they will show an empty vault if you are selfhosting vaultwarden.
It seems to be an accidental bug in the bitwarden clients that are assuming that they’re talking with official servers
It’s fixed with the latest release of the vaultwarden server that was published a few minutes ago
If anyone’s Firefox auto updated like mine you can uninstall the extension, go to the Bitwarden extension page on the Firefox website and manually install the old version. Only needed if you can’t update vaultwarden right away.