Thumbs scroll is off when thumbs have slidesPerView and slidesPerGroup

[HandHugs]

This is a (multiple allowed):

• [x ] bug

Swiper Version: 6.4.11

Platform/Target and Browser Versions: Desktop Mac/Chrome

Live Link or JSFiddle/Codepen or website with issue:
https://stackblitz.com/edit/swiper-thumbs-issue-slidesperview?file=index.html

What you did
I have a horizontal Swiper with horizontal, grouped thumbs. For example with 10 thumbs. I click the thumb slides to navigate the big horizontal Swiper. Additionally I have arrows Next/prev to slide the thumbs.

Expected Behavior
If I click a thumb the following should happen:

the main swiper should show new slide
the thumb swiper should remain in its position showing the currently active thumb I clicked

If I swipe to a new slide in the main (top) gallery that has a thumbnail not currently in view, the thumbnail gallery should scroll to the correct group.

Actual Behavior
the main swiper shows new slide -> this part is fine
if I click the first or last of my actually visible thumbs (for example 1 or 6) it works correctly
if I click 2-5 thumbs the thumb-swiper is slided to the prev thumbs.

If I swipe to a new slide in the main (top) gallery that has a thumbnail not currently in view, the active thumbnail remains hidden (thumb slider does not scroll to correct grouping).