1Password Search doesn't find an item but I am able to access it via the vault's event history

I can't remember if I used the desktop app or else when I brought up the creds in 1P, but I even bookmarked it, lol, and so that works too, via that, so I don't have to search for it in the event log anymore. The vault I'm speaking about has a lot of entries, but most of them, including the one I'm talking about, are rather small, just login credentials. So it's likely not about the size. Although I mentioned fairly large vault but I'm talking about a few hundred entries and very very few have any attachments. This one didn't have, just a username, a password, an OTP, a URL and a description.

I did some testing and ended up creating a new login item by simply manually copying all info from the unfindable entry, then deleted the problematic one. I can see the new item immediately with all versions of 1Password.

I don't know what this was but let's hope it won't happen again, or even if it happens we can notice it in time, and not like during a major incident or something.