This problem was inherited from my older Mac Studio as a result of restoring it seems. It works on my other MBP just fine and my current Mac Studio with a different profile.
When I search with the Icon view, it shows large icons instead of actual thumbnails, as it does properly when I simply view the directory. What I have tried with no success:
Force quitting the com.appple.quicklook.ThumbnailsAgent and then force quitting Finder
Going into View > Show View Options > toggling "show icon preview"
It's a frustrating issue with so much media not to be able to see what I'm searching for and filetype doesn't seem to matter, they show a default application icon. Any other ideas?
What version of macOS on your Studio and MBP? The screenshot shows an external SSD, I presume - what file system is it using? Are all search results including on the internal Studio SSD are affected?
Did you delete /Library/Caches/com.apple.iconservices.store (also in /private/var) ?
After that execute the steps you have done and delete the system cache. Then power off your Studio.
Restart your Studio into safe mode. Run it in that 5 minutes.
Restart into normal mode. Check the icon previews.
One free tool which offers an interface to some of this, is Onyx.
