[Zotero 7 Beta] Preview appearing in the Item Pane of the PDF tab

mjthoraval

Steps to reproduce:
1) Open a PDF file in a Reader tab
2) Go back to My Library
3) Close and re-open the Attachment section, where the Preview is activated
4) Go back to the tab
-> The preview appears also in the Item Pane of the PDF tab:
https://s3.amazonaws.com/zotero.org/images/forums/u265723/p862fjhov5jjla81avlc.png

Debug ID: D1378531624
Zotero 7.0.0-beta.74+2e8073ab9 (64-bit)
Windows 10