An example: 1) Start with a recent upload, e.g. https://wallhaven.cc/w/l87v1p 2) Click on the "Acheron (Honkai: Star Rail)" tag 3) This results in https://wallhaven.cc/tag/151308 3a) As I post this, the image count is 45 3b) The page displays a 3x5 grid, so 15 of the 45 reported (So far, this is all expected behavior.) 3c) Click on the "More Acheron (Honkai: Star Rail) wallpapers" button 4) This results in https://wallhaven.cc/search?q=id:151308 4a) As I post this, the search reports "6 Wallpapers found for #Acheron (Honkai: Star Rail)". Definitely fewer than 45, and less than the 15 shown on the previous page. 4b) Re-enabling the AI filter and reloading changes the url to "https://wallhaven.cc/search?q=id%3A151308&categories=111&purity=111&sorting=relevance&order=desc&ai_art_filter=0", but no change in the results. (As expected in this case, except for there still being only 6 results.)
In other instances, the "More X wallpapers" button returns NO results, even though I only used existing links on the site. It's not a filtering issue, since I'm explicitly enabling all to verify.
Could this be an issue with a JOIN clause? (Recently zerochan had an issue where users who were logged in could not browse, although anonymous viewers could. That one turned out to be an unoptimized JOIN which caused all results after the first page to be suppressed.)
I've noticed this behavior for a few weeks now, but it's only an issue when I'm looking for previous uploads for the same artist, character, or model.
Thanks!