Cannot see previously loaded and edited images

I have a question about LIGHTROOM, it seems that I have a serious problem with the program.
4 days ago Lightroom updated itself to the latest version (14.01).
Since then, Lightroom cannot see my previously loaded and edited images. Also, strangely, he sees it randomly. There is a folder (which is more than half a year old) and lightroom can see them all.
But the images uploaded within 3 months are only partially or rather not at all. Even when opening the library, the picture is quite strange. For some, lightroom can see the name of the folder, but it says that there are 0 images. There are some where Lightr. can see the name and writes the number of pictures, and pictures are displayed in Lightroom, but for example only 36 of the 864 uploaded pictures from my trip are displayed. However, I edited and saved over 200 pictures of them, they should still be there.
What could be wrong? Because this is really not good.. I did a photography job 2 weeks ago and fortunately I finished it, but now only 1 of the 6 folders appears in Lightroom and the others are as if they never existed.
I didn't delete anything from Lightroom. Everything was fine before the update.
I have new HP laptop with Windows 11 Home
Please help me, what to do in this case?
Thank you very much in advance for your help!