Imported photos not appearing in catalogue
In the last few days when I import photos into Lightroom I have found that Lightroom does copy them to disk, but doesn't show them in the catalogue. Here's a walked through example
I click import and Lightroom correctly shows that one picture is yet to be imported:

It also shows that it would be a new file:

But at the end of the import Lightroom shows:

"No photos in Previous Import"
I've tried Restarting Lightroom to no avail. The file is correctly copied to disk, so if I choose "Synchronize Folder" it shows this:

I can reproduce this - I've just been through the exact same steps with another import. For the avoidance of doubt the copy to disk and add to catalogue option is selected in Import:

Expected results: Photo should be imported to disk and added to catalogue.
How can I help diagnose and fix this?
Versions:
Lightroom: 12.1 [ 202212072312-d7ab524b ]
Windows: Windows 11 22H2 OS Build 22621.1105
