Just did that on a test bitwarden account with a spare YubiKey 5NFC: with all yubikey’s interfaces disabled (even FIDO U2F) except FIDO2, then when adding the yubikey as 2SV Passkey it creates a non discoverable FIDO credential (whether the YubiKey’s FIDO2 app has a pin or not).
Well, I would also, because with that same account and YubiKey 5NFC, with all yubikey’s interfaces disabled (even FIDO2) except FIDO U2F, then it lets me add that YubiKey as a 2SV Passkey.
Btw, I think this is getting way off-topic from the original feature request.