Exactly the same story here. Using a QNAP TVS-872XT, connected via TB3 to x2 iMacs. Only one of them has the latest update (11.13.1) and I'm no longer able to connect via Thunderbolt bridge on that machine. I'm also getting a 4 minute boot time where the progress bar gets stuck halfway. Deadline day today for clients and have totally run out of options. HELP APPLE!
The-Visuals-Team
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I have a fix for 11.3.1 that doesn't require upgrading to beta!
I've been on the phone with Apple support for 2 days, and we ran a diagnostic report on the 'WiFi' and then about halfway through the test, completely randomly, the Thunderbolt Bridge connection was esablished via TB3.
It might not work for you guys but worth a shot!
Firstly, Option+click on the WiFi symbol in the menu bar, then hit "create diagnostic report".
Good luck!
I can confirm that it is still working after a shut-down but the boot time hasn't been fixed and is about 5 minutes.