Went ahead and compared live to PTR (exact same build and setup). This is the exact scalar that popped out. Can confirm Tinne’s work! Thank you for jumping in, testing and explaining.
It seems like this is definitely not a bug then. This thread can be closed/disregarded. For anyone interested in a discussion regarding the feedback of this “hidden and unintuitive” nerf, you can participate in this thread in the feedback section: https://us.forums.blizzard.com/en/d3/t/chantodos-feedback-change-how-the-nerf-is-implemented/