Social interactions scroll bar appears broken

Clones MC-202150.

The bug

The social interactions scroll bar once again appears broken. This was fixed in 1.16.4 Pre-release 2, but is once again an issue in 21w10a.

A screenshot is attached.

How to reproduce

1. Join a server with a few other players online (if there aren't enough players online, increase your GUI scale)
2. Open the social interactions menu
   The scroll bar appears broken