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You're not crazy, other Galaxy Watch 7 users report ghost vibrations
These issues have been going on for a while and there's no clear sign of relief.
Some users blame the Google Maps "mirroring" feature while others claim the Samsung Health Platform, sensors, and activity permissions are the problem. Samsung's latest Galaxy Watch has been driving users mad, but only because the device is tricking folks with fake alerts. A main driver of this issue is that these "notifications" are empty as users report their Watch's display doesn't light up when vibrating.
Or read this on Android Central