Last year I experienced an issue where I had a set of images in Lightroom (cloud) attached to a specific catalog (I'll call it Catalog 3). When I wanted to import some images from Catalog 4 into LR, I didn't realize (despite the prompt) that it would delete all of the images from Catalog 3 since you can only have one catalog attached to LR at a time. I had backups of all of my shoots/albums except for two.
I'm not sure if I will find a solution for this because the issue happened sometime last year, but I stumbled upon a few other topics with similar issues, and they were able to have their files recovered. This would be so helpful to me as I would really love to have them back. Thanks in advance to anyone who can help with this.