Forum list view bug

[hardlemondrink]

Checklist

• [x] I am reporting an issue in existing functionality that does not work as intended
• [x] I've searched for existing GitHub issues

Description

iOS client has a problem with a list in a forum group. swipe top in a group and after that fast swiping down in a group of this type shows an empty first line of the list instead of the first pinned one. when you swipe down again, everything is restored as it should be. Screenshots and videos are attached.

Expected Behavior

There will be no empty forum subgroup line in the list

Actual Behavior

empty subgroup string in forum list

Steps to Reproduce

1. have a group with the forum type and several pinned posts, as well as an archive
2. go to the forum
3. swipe top
4. fast swipe down - now u will see the empty line
5. swipe down again - now you will see what you need

Screenshots and Videos

Video

Environment

Device: iPhone 13

iOS version: 16.1.1

App version: 9.2.1