"Place new items next to the existing ones" creates issue when using FalconX (for centering icons in the Taskbar)

There was this request https://tweaker.userecho.com/communities/1/topics/285-center-taskbar-icons

And there is another application that can do this already -

https://chrisandriessen.nl/web/FalconX.html

However when used with 7+TT and with  "Place new items next to the existing ones" enabled, it forces the taskbar icons to slide back to the left for a moment. And not always - ONLY when 7+TT fixes the position, which means cases where you open a new window of existing opened application and its icon is not the right-most at the taskbar. Otherwise the issue does not happen.

Or, of course, a proper implementation of this feature in 7+TT itself would make FalconX obsolete and there will be no need to fix this.