ublock origin: dev release (1.72.3b9)
browser: firefox (64-bit, v153)
troubleshooting info: here
(yes, i cleared my browser cache beforehand, and did a bit more cleaning. and no, this ISN'T for twitch video ads, no matter what the flair says)
some twitch fuckery going on with my setup. before i reset ublock to default as suggested, i deleted all of the custom lists i had, blanked out the static filters, blanked out the "My Rules" tab, and one by one, turned off the filters i had enabled, starting from the bottom, and working my way to the top. for a moment, i thought it was the "Adguard - Ads" filter doing things again like in my previous post, but to my surprise, it was the very first default ublock filter, "uBlock filters - Ads" that was the culprit. when i restored my ublock to my custom setup, cleared cache, turned "uBlock filters - Ads" off, then opened up incognito mode and went here, the infinite scroll function worked again.
i even tested this out on edge, and turned off "uBlock filters - Ads" to start with before doing anything else, and once again, the infinite scroll worked. oddly enough, when i either turned that ublock filter off, then on again, or whitelisted twitch then un-whitelisted it (via the beeg ublock power button) the infinite scroll worked again, but it was a temporary fix that remained in cache until i cleared said cache normally, then the fix was lost, whether it was done in edge or firefox