Lightroom Classic identifies files as "either unavailable or damaged" when I can access them with PS

I've been using the Photoshop Elements Organizer for over 20 years as my image cataloging tool.  Once the product stabalized it's done almost everything I needed.   In my editing workflow I'm using Bridge for accessing and Photoshop 26.1 for my editing.  I've never really liked Lightroom but yesterday I though I would take another look to see if it would be suitable for my cataloging needs.  The first thing I did was import the Organizer's catalog.  That took quite a long time, but it eventually completed.  However, Lightroom complained about some of the images and gave me a list of 96 files that it said were "either unavailable or damaged."  In the list were a couple tif files and the rest were psd files.  I've checked several of the files it reported and I was able to see their thumbnails with the Elements Organizer, and able to access them with Bridge and Photoshop.  Bridge does provide a thumbnail graphic for these images.  Lightroom seemes to know the file is present on my drive since it provides a placeholder graphic for these images, but it does not show the actual image thumbnail.  For a couple of the images I opened them in Photoshop, made a trivial change and replaced the original copy with the modified one.  Afterwards Lightroom still did not show the actual image thumbnail.

Does anyone have an explanation?