There's a bug when you add a JPG or PNG to the Lightbox and afterwards you compress it into the webp format. The Media seems to be gone, but the file is still somehow there. You'll add the new media file and than you have both. To fix it now I need to place newly greated lightbox instances and set everything up again... double the work.

See it in Action
https://www.loom.com/share/5f91e7da388d45eabc1df39be5621f74