Oof.

An issue exists in the YubiKey FIPS Series devices with firmware version 4.4.2 or 4.4.4 (there is no released firmware version 4.4.3) where random values leveraged in some YubiKey FIPS applications contain reduced randomness for the first operations performed after YubiKey FIPS power-up. The buffer holding random values contains some predictable content left over from the FIPS power-up self-tests which could affect cryptographic operations which require random data until the predictable content is exhausted.

Self test more like self harm.

https://www.yubico.com/support/security-advisories/ysa-2019-02/