Title.
The problem is, leaking_diaper is for when a diaper leaks- which, 99% of the time, is for when it leaks urine, not feces. On the flip side, messy_diaper does not imply urine- it implies feces. The "correct" tag here is wet_diaper, NOT messy_diaper.
You have a tag that is supposed to be tied to watersports, that tags images as containing scat. This is a big problem, as quite a few of us like watersports and heavily dislike scat- to the point where we blacklist feces.
This wrong implication is hiding things behind the blacklist that we actually want to see.
https://e621.net/post/show/2030590 This image is a great example of the problem. It shows a character urinating into a diaper, and it even includes an X-ray view- with only urine in sight, no feces. And of course, the diaper is leaking urine. And yet, because of the leaking_diaper->messy_diaper->feces implication chain, it is tagged as containing feces and thus hidden on my blacklist, even though it contains no feces- and in order to actually remove the offending, wrong tags, I would need to remove a tag that actually does apply to the image, leaking_diaper.
Updated by Siral Exan