What got me really mad is searching your own history. There's this "search watch history" on the https://www.youtube.com/feed/history

I remember watching video that contains certain word in the title. A minecraft contraption from a small channel (4 videos, 93 subs). I searched that word in the title. But youtube can't find it. Fortunately, I saved the world download that listed in the video with the name of the channel. So I searched the channel name + the word, it still can't find it.

So I searched only the channel name instead, in the search page. It works, and checking their videos, youtube mark one of them as watched. With the exact same title I searched. But it didn't show me in the history search. WTF youtube.