I tried to figure out if there is any difference between my and your systems - didn't find any.
Here is a short reading how it works:
https://www.eos-magazine.com/articles/EOS_feature/canon-image-stabilisation.html
Note this particular sentence:
" When IS is switched on and the shutter button is partially depressed, the stabiliser lens group, which is locked in a central position when not active, is released. Then two gyro sensors start up and detect the speed and angle of any camera movement. "
Here is my logical explanation:
There is one small problem in my system and it's the same with the (single) Sigma lens that I use: If you turn your camera off before turning off the VR (IS in your case) you may hear some noise in the lens later. The reason is that the VR (IS) group of lenses
is not locked in central position because you just shut the power off. They need that power to be locked in "central position" and you can use the lens without the IS engaged! In other words: turn off the IS before you turn off your camera. To turn it ON the sequence is opposite. For my system (Nikon) they say that it is not going to damage your lens but to return it to "normal" function you have to turn off the VR, turn the camera ON and than turn the VR ON again. With Sigma it's more scary - they say you may damage your lens if you don't follow the right sequence...
I'm pretty sure in the Canon system it works similarly (if not identical!) - read the instructions that are coming with the lens.
And as usern4cr say: "Smile, relax, and enjoy one of the best lightweight tele-zooms ever made!"