Data screens changing unexpectedly during the activity

Hi,

I'v just finished my first run with my new Fenix 5 Plus (sw version 5) and noticed one annoyance.

So my activity was Trail Run with the default data screen setup plus virtual partner screen inserted somewhere close to the end of the sequence.

This was the strange behavior I observed during the activity:

step 1: I scrolled to the screen no. 4 (heart rate zones)
step 2: after some random time (10-30 seconds) my screen no. 2 got shown (Ascent/Timer/Vert. Spd.)
step 3: then after even shorter period of time, my screen no. 1 got shown (Distance/Timer/Pace) and stayed there

This happened every single time after I scrolled to heart rate zone screen.

What I would expect, provided that Auto Scroll feature is turned off on the activity, which was indeed my case is that when I manually scroll to a specific data screen, this screen stays active until I choose another one.

Another detail I noticed was that screen no. 2 was shown in the step 2 with reversed colors (dark background, bright text) contrary to normal appearance when I scroll manually.
Anyways, does it has some meaning?

I could not figure out if this behavior is intended, what is it triggered by or what purpose does it have.

So is it a bug I should report or do you have some explanation/solution for me?

Thanks.