Using Garmin Connect on my iPhone 13 Pro running the latest STABLE (non-beta) version of iOS, I disabled ALL smart notifications. I do not want any phone app sending notifications to the watch. I synced GC to my watch and confirmed the setting on the watch matches the Garmin Connect setting.
Phone notifications are still showing up on the watch. I presume this is a FR955 bug in the watch's OS.
Note that this issue is being reported by FR955 users on Reddit, so it is not just an isolated occurrence. I did send Garmin support an email but I wanted to create a post here in the event others are searching for this issue.