Indeed. It wasn’t clear to me that the fridge was not on a smart plug. Depending upon the Sense native detection though, in theory any device (including a fridge) could have an Always On component even if it’s not strictly always on. It doesn’t have to be on a smart plug to potentially register an Always On component.
It doesn’t explain the absent bubble (when the timeline shows “Fridge On”). Posting the fridge detection Power meter detail could help with troubleshooting.