I'm the owner of a Vivosmart 4 and Instinct Solar.
Before the update of the sensor hub, the active calories shown in the two clocks were very similar to each other.
Without training, between 400 to 500 active calories during a normal working day.
After the update, during a working day full of meetings, during which I had been sitting for a long time, the active calories at the end of the day was more than 1000.
Not even after an hour in the gym I have ever reached this value!
Are you sure Garmin of the goodness of the update?