Featured Images not Uploading to S3 Server

I’m having the same issue in our Blog area:
https://dragutierrez.com/#blog

Old entries (until Feb 4th) display the Featured Image correctly.
Newer ones don’t (the photo you see were added manually by me into the text area and before the MORE tag).

Any idea how to fix it?

Generally, this happens when your theme is using a dynamic cropping/resizing library, such as Aqua-Resizer.

https://github.com/syamilmj/Aqua-Resizer

Only image sizes created using the native function add_image_size are supported.

https://developer.www.ads-software.com/reference/functions/add_image_size/