When I searched the tag "Pokémon" earlier today it was fine; but, now recently, it failed to find all the relevant images. it's showing stuff that's over month old in the first 60 images; escalating towards 8 years within a several pages. The bug isn't going away after multiple attempts, and seems to only affect the tag in question.
for example this image can be found thru tag "plundered", but not thru tag "pokémon"; despite having both.
https://e621.net/posts/3520355
update [8/23/22 5:39 PM (PT)]: it would seem the query is currently rebuilding itself; as a given page (300) is changing what files are shown, rapidly, showing more recent entries as time passes.
Updated