Why is there a problem with change detection in angular when using modified scroll?

Question

Angular

Hi all. I use https://github.com/MurhafSousli/ngx-scrollbar in angular and there is some problem with change detection later on components where scroll is used. Auto-update is enabled at the scrollbar.

5ka it's just a variable, not observable or something else, and not inside the scrollbar. On the scroll event, change it to 1, we see that everything is ok in the console. And the page is not updated.
I don't understand what's the matter. Trouble with the detector. For each sneeze, the change detector is also somehow not desirable to call.
Maybe someone knows why this is happening.