Lightroom Classic 10.4 has “lost” all the images in random collections (shows 0)
Here’s a new one on me…and not a good one. Was looking for some older images just now, and noticed that many of my collections inside my catalog now show 0 (zero) images in them! These are jobs image collections, withing a collection set of all of that years jobs, inside another set covering a 10 year spread. So I have a collection set, 2001-2010 images, inside of that are many collection sets- one for each years personal images, one for each years jobs, and inside a years jobs, a collection for each job. Previously each collection had images in it, but now, many of those job collections show no images in them… but not all- see a sample below:

I checked, and all of the images are still in the same folders on the same hard drive that they were in previously, so why in the world would Lightroom have “lost” them- it is not showing they are listed in collections and can’t find them, but that those collections are just empty. The missing images seem random, as some collections still have all(?) their images, some don’t. This seems to have happened to images that cover a span of 5 years- no idea when this occurred, but seemingly recently, as I am often accessing those collections. The only thing I have done is update Lightroom to this current version last year.
I have yet to find any other collections inside different collection sets that are also missing their images. I tried optimizing the catalog, restarting Lightroom, but to no avail.
Has anyone else experienced this behavior, and if so, what did they try to get the images to show up again? Thanks.
Lightroom Classic 10.4, macOS 10.14.6
