I use selfhosted vaultwarden [0] instance (its a rust implementation of the bitwarden server), and the bitwarden apps (i point the apps to use my server instead of bitwarden).
Vaultwarden + bitwarden client apps (for desktop/browsers) have passkey support, and i've been using them for a month or two without any issues.
That being said, bitwarden client apps for android and ios are going through a rewrite (from xamarin to native iirc), and are yet to support passkeys. However, the bitwarden folk said passkeys are the next feature coming to these apps.
[0]: https://github.com/dani-garcia/vaultwarden
