All InBoxes folder not showing all emails after OS27 update. Only populates after clicking on Gmail and iCloud folders first.

After installing OS 27 on the iMac, when going into the Apple Mail client, the All Inboxes folder only populates with 4 or 5 emails.  However, if you then click in the Gmail or iCloud folder you can see all the emails.  Only then can you go back in see all the emails in the All Inboxes folder.