Can’t Bulk Compress Images Previously Compressed by Smush Plugin

WP-Optimize will not make images previously compressed by the Smush plugin available for bulk compression. These images don’t appear in the list of “Uncompressed images”, even if I choose “Mark all images as uncompressed”.

I can still compress these images individually from the Attachment Detail pages in the Media Library. On the Detail page for each of these images, there’s a note: “Note: This image is already compressed by another plugin”.

I want to be able to compress these images in bulk since WP-Optimize provides a great deal of additional compression over what the Smush plugin did. There are hundreds of images previously compressed by the Smush plugin; it would be too time-consuming to do these one at a time from the Attachment Detail pages.

Thanks.