Somewhat similarly, I encountered a possible bug in Google Docs many years back. I was reorganizing my documents, and I temporarily changed one of the names to "delete". Poof -- I could not longer find it anywhere (or even search for words that I knew were in it). I forget how I got back to it (maybe via my browser history), but I changed the name a bit, and then the document was "found".

This could have simply been a race case unrelated to the filename, but it's much more amusing to speculate that it was due to hack introduced during development. I now regret not trying to reproduce it, but I was pretty frustrated after I found my document again. I did contact support, but didn't hear anything back.