I know my games get quarantined which is one level worse but I didn't realise how many games don't get indexed these days, I think there are more than 10 games from the Jam which don't appear when searching by their name on the site, and now I can only imagine the number of hidden, cool games one misses when looking for games through tags. 

Yeah, it makes it hard to find them in the Itch app too!  I've started just copying the URLs there if I need to download one...  I'm not sure on the cause, though I'm under the impression games entered into jams get less exposure in general (probably for good reason), but might also just be a case of games not being tagged right or missing some metadata, or just an Itch bug...