Non-Classic Galleries Not Displaying Caption/Description

I have been adding captions to the images on my website for many years using Adobe Bridge. Bridge’s IPTC core editor does not have a “caption” field, so I use the “description” field in Bridge which then gets translated to the “caption” field by WordPress when I import media using the standard media importer. Recently, since the advent of what I’d call “non-classic” tiled galleries, the captions attached to images have stopped showing up. I don’t know how to fix this…

Here is an example of a post that has a tiled mosaic gallery using the “classic” WordPress editor: https://valtenbergs.com/archives/25634. You’ll note when one hovers over the images, the captions show up. The captions are also visible when one clicks on an image, which brings up the carousel slideshow.

Here is an example of a post that has a tiled mosaic gallery using the “non-classic” WordPress editor: https://valtenbergs.com/archives/27445. You’ll note when one hovers over the images, the captions do not show up. The captions are also not visible when one clicks on an image, which brings up the carousel slideshow.

The captions/descriptions for all the images in both of the above posts are created in the same manner: using Adobe Bridge. The only difference is the second post uses the newer, “non-classic” WordPress editor to import the images and create the tiled mosaic gallery.

How can I get the current version of the WordPress editor to display captions attached to images like it used to?! Thanks!

The page I need help with: [log in to see the link]