Carousel: adding image to post that is already in a gallery on that post hides exif

#### Steps to reproduce the issue

1. With the JP Carousel feature activated, create a new post with a gallery. One of the images should have EXIF data.
2. Publish and preview that gallery carousel to make sure you see EXIF data for one of the images.
3. Back in the post editor, add one of the images with EXIF below your gallery using a standard Image Block.

#### What I expected

For EXIF data to continue to show in the Carousel view.

#### What happened instead

EXIF data is no longer shown for that image if the same image is added to the post in a standalone Image Block.

Video demo:

https://user-images.githubusercontent.com/15803018/127910292-1089ebe2-1639-4799-9be6-2a6557293e54.mov

Context, internal: p8oabR-HY-p2#comment-5451

Reproduce the issue with the JP Carousel feature by creating a gallery post containing an image with EXIF data, then adding that same image in a standard Image Block. Compare the carousel before and after the standalone image is added; done means the EXIF data remains visible in the carousel.

Written by the indexing model from the issue text.