So although apple has it documented that notifications with duplicate identifiers in the same session won't be presented. They apparently forgot to mention that macOS also non-deterministically and without any errors, logs or warnings will also not present some notifications in future sessions if they have a previously used identifier.
As such, we're going to truly randomize these identifiers so they are
unique between apps and sessions. The identifier now consists of a
randomly generated UUID and the app bundle id.
45d90e77b7