Jeremy,
If it can be of any use, I have one prototype site where a carousel gallery with images containing sizing information appears to work just fine:
https://www.spotters.com.ar/wpx-04/?p=1243
A further two sites, however, do display the wrong image in the carousel if file names contain sizing information.
It appears that the system picks-up the smallest of the image’s thumbnails in the /wp-content/uploads directory instead of the original one.
One sample post confirming the error is available here. Notice two comparative galleries (access password: weird-carousel):
https://www.gacetaeronautica.com/gaceta/wp-101/?p=6378&preview=true&preview_id=6378
Regards,
Carlos Ay
