All the photos saved to the SD card are gone

Today when taking some photos, I'm noticed that their disappear a few seconds after they are taken, then checking, I see that ALL the photos in the SD card are gone, they disappeared without leaving any trace (they aren't in the paper bin).

The ones in the internal memory are still there, and also all the music collection (near 100GB) is still in the SD card, only the photos in the SD card disappeared.

Anyone more has the same problem or known what can be caused this?

Note, backing up the photos to Google Photos is disabled, as I don't like my photos in the cloud.