Hi @mlchaves !
Thank you for your message.
Sorry, I forgot to update my post. The problem is now solved.
Turns out the problem was unexpected, and had nothing to do with WordPress. Our hosting provider’s servers had a limit as to the number/volume of files that could be transferred in a single folder. Our client had uplaoded a lot of images, which exceeded that volume. When they were uploading on our test server everything was fine; but after the migration, it translated in weird missinge images, with no clear pattern/clue as to why some images were impacted and not others.
Marking the issue as resolved.
Thanks again!
