Exclude post selected as “group homepage” from “group posts” loop

Hi again

I think it is better to exclude post selected as “group homepage” from “group posts” loop / tab.
I mean this post works as a “page” so should be treated differently from other posts. For example some may heavily decorate it with page builders (Elementor, Visual composer, …).
So, at the moment:
1. This post will look peculiar in “group posts” tab.
2. This post is shown both at homepage tab and group posts tab.