Pagination with posts block not working on home (landing) page

[vidarsko]

Description

The pagination feature looks okay, but when you press either a number or "next", the navigation breaks. Also, it seems that the number of pages is not correct, see screen shots.

This only happens on the front page as far as I can see, when i include the feature on a site, it looks okay.

Step-by-step reproduction instructions

1. Make 9 posts
2. Add posts block onto landing page, enable pagination
3. Check the frontend

Screenshots, screen recording, code snippet or Help Scout ticket

Landing page before clicking. Shows 1 to 4 even though there should really only be 1 to 3:

After pressing Next ("Neste" in Norwegian). Directed to homepage.url/page/2 as expected. Next posts display correctly, but navigation broken:

Pressing 4. Directs me to homepage.url/page/4, but posts are wrong (I dont even know what they should be).

Pressing 1. Brings me to homepage.url/page/1. Posts are wrong.

Manually going to homepage.url/page/3. Posts should be Test3, Test2 and Test1, but no:

Environment info

https://pastebin.com/Tin60bc2

Is the issue you are reporting a regression

No