The <gallery> tag renders very large thumbnails when displaying 3D files using the packed mode.

Steps to replicate the issue:

• Go to https://commons.wikimedia.org/w/index.php?title=Commons:Explore/3D&oldid=1178299771
• Look at the size of the thumbnails

What happens?:

Thumbnails are way bigger then expected

What should have happened instead?:

Compare with:

• gallery tag using "packed" mode with 2D files
• gallery tag using the default mode ("traditional") with 3D files