Source:Pixiv not working correctly

Currently, the Source:Pixiv tag isn't working correctly. It only seems to effect some images instead of all of the ones from Pixiv.

For example, I'm searching the tags: Es_(xblaze) -source:pixiv

Regardless of that tag, the pictures that appear have their source still as Pixiv. I've also noticed that if I just search for "Es_(xblaze) source:pixiv" It doesn't show all the pictures that of Es_(xblaze) that have Pixiv as their source.

Because source:pixiv doesn't work the way you think it works. It basically searches for the substring "pixiv" in the source box and returns all results, however most of the Pixiv image urls nowadays have "pximg" instead of "pixiv" in the image URL.

issue #3715 would fix this by providing any and none modifiers for the pixiv: metatag, but that was submitted over a month ago so it'll be a while if ever before that gets fixed.