Broken sidenav of Reader tab after pinning section and switching tabs

mjthoraval

Steps to reproduce:
1) Pin a section of the sidenav in a Reader tab
https://s3.amazonaws.com/zotero.org/images/forums/u265723/nflxf7p8m1c4g33r1ebo.png

2) Go to My Library
3) Back to to the Reader tab
-> The first part of the sidenav cannot be used anymore:
https://s3.amazonaws.com/zotero.org/images/forums/u265723/v4tc6f8gb7o946bi7yi4.png

It can be recovered by clicking on the Notes Pane button.

Zotero 7.1-beta.36+1eacc8bbd (64-bit)
Windows 10