What does ⌛︎ Preview Hidden in macOS Messages app mean? One of my contacts with whom I exchange iMessages, has started showing ⌛︎ Preview Hidden in the macOS Messages app just below their name.



Interestingly, this is not shown in the Messages app on my iPad and iPhone, just the Mac. Also, I have not enabled Hide Alerts for the said contact. I am able to communicate with them normally, and I also receive the notifications for any messages that they send.

My questions are:


What does ⌛︎ Preview Hidden mean?
What causes it to get enabled?
How to remove/disable it?
Does it apply to all the devices linked to my Apple ID and where Messages are enabled?


I use Messages in iCloud, and I am running current up-to-date version of OS on all the devices that I use (macOS Catalina 10.15.4 (19E287) on Mac and iOS/iPadOS 13.4.1 on iPhones/iPads).
I had this too and this seemed to give me what I wanted (the preview):
System Preferences->Notifications->Messages->Show Notification Preview->set to Always. Then Quit Messages and restart.