You can have a typo, but in this case you have a writo.
Madness string 93120
When the PhanTypeMismatchArgumentNullable issue is suppressed, it complains about an unused suppression comment and when said issue is not suppressed it spams warnings about... PhanTypeMismatchArgumentNullable.
Some pain you can't forget. You'll carry this pain with you for the rest of your life.