Google keep, Samsung reminders, and probably some other apps have problems with gboard on GW. In case of keep this means you cannot create a new note.

According to information I got, this happens because they use a deprecated keyboard API, which, however, still works on wearos 4 with the default keyboard and fails otherwise.

Not sure if better support of a 3rd party keyboard is an important enough issue for Google and Samsung to fix their app :(