This website (https://a2zapk.com/724636-youtube-vanced-15-05-54-fix-dark-no-root-a2z.html) is detecting adguard, it detects nearly all adblockers atm, including extensions that are pretty good at bypassing anti-adblocks. I'm pretty sure it's using a modified version of (https://www.detectadblock.com). The adblock popup won't appear unless the download button is pressed. It does a check and if it detects adblock direct download is disabled, it's a script that runs that's causing it. It's blocked by adguard base filter, once unblocked it does let me pass and adguard still blocks the actual ads but there is an annoying placeholder left a few of them that won't even let me press the download button unless I manually add them to blocking lists. I hope a bypass for this could be added to adguard annoyance or something. It's pretty annoying and it's detecting basically everything atm.