problem with operation between Lightroom & Photoshop

Hello

I've problems with the working between lightroom and photoshop for a while and I can't fix it.

When I edit photos in LR and send a picture to Photoshop for an edit, the picture returns neatly and is in my catalog.

But when I restart LR the day after, this picture is gone.

The pictures i've edited in photoshop are no longer displayed in Lightroom.

I usually found the pictures by looking for the relevant folder in the library module an then synchronizing it. But now this also no longer works.

Moreover I sometimes lose my selection tools such as flags and color labels, but not always.

I also created a new catalog and saved it on the computer. Unfortunately, I now have the same problems with the new catalog.

Does anyone have an idea how i can fix this please?