WebAuthn::AttestationStatementVerificationError #336

When registering a YubiKey 5 NFC using FireFox on Windows 10 20H2, i recive a WebAuthn::AttestationStatementVerificationError
Using the key for logins on FireFox (after registering it with Chrome) works fine.

The problem occures only if all of the following conditions are met:

• key registartion
• firefox
• yubikey
• webauthn-ruby

FireFox / webauthn-ruby / YubiKey => AttestationStatementVerificationError
FireFox / webauthn-ruby / Win10 PlattformAuthenticator => OK
FireFox / webauthn.io / YubiKey => OK
Chrome / webauthn-ruby / YubiKey => OK

any idea how to debug that?