gallery-dl not fetching full res images from artstation

[Twi-Hard]

The metadata for most images I check list a much higher width and height than what was downloaded.
Here's an example:
https://www.artstation.com/artwork/ZrP4X
https://cdna.artstation.com/p/assets/images/images/010/595/554/large/holivi-enfunzya-.jpg (an image URL from the post linked above)
After some testing it seems replacing "/large/" with "/4k/" gives a much higher res image (I'm not sure if it's always the original or not).
Out of the images I checked, only gifs can have "/original/" in the URL. Every other image 404s when I try to replace "/large/" with "/original/".
Example gif:
https://www.artstation.com/artwork/3zPJY
https://cdna.artstation.com/p/assets/images/images/007/783/838/original/juan-cardenas-party-cannon-1080x1080.gif

In this help page (https://help.artstation.com/hc/en-us/articles/360056654272-How-do-I-get-the-best-quality-of-images-on-ArtStation-) it says it shows you the 4k versions instead of the resized versions if you use a 4k display.
"ArtStation will convert images to JPG at 90% quality at 1920 width. However, if you have a 4K monitor, we will send the image in 4K if it is available."

[mikf]

Fixed in 52a7913, I hope.

images now use /4k/ with fallback URLs to /large/, /medium/, and /small/. GIFs like https://www.artstation.com/artwork/3zPJY already used /original/ without needing to change anything.

Every other image 404s when I try to replace "/large/" with "/original/".

They return a "403 Forbidden", meaning they do exist, but I'd guess nobody except the uploader is allowed to download them.

[Hrxn]

Good catch, but does anyone know if this has been a somewhat recent change?
Apparently, the 4k image option has been around for a while, but I'm not sure what the actual intention of the site is here.
I mean, just for example, this artwork link: https://www.artstation.com/artwork/R3dNAA

It has this little 4k overlay icon at the bottom, with the hover message of Pro and Plus members can display assets in 4K

But if I open the image (the "bracket" icon, to the right of the downward-download-arrow-icon), I'll get this here in a new tab;
https://cdnb.artstation.com/p/assets/images/images/036/493/845/4k/aleksandr-nikonov-exploring.jpg?1617817892

So, a /4k/ URL, and the image indeed has the dimension of 3840*2604px.. if I recall correctly, ArtStation did not have such large images in the past.

And this specific artwork is not an outlier, lots of other entries exhibit the same behavior.

[mikf]

Danbooru uses /4k/ since March 2020 (danbooru/danbooru@266e405), so this existed for at least a year.