Here you can find a product : https://www.mineraux.fr/boutique/uncategorized/galets-labradorite-1kg/
I’ve found that despite I deleted every image I had to replace in the media page, I still find these images in the Cleaner page.
When I click on one, it says that the image doesn’t exist anymore.
I think there’s a cache problem, that prevents me from adding an image to a product through WC REST API if this image with the same url already exists somewhere on the WP site. And with the cache images, it does still exist.
But maybe I’m wrong…