I just discovered when playing around with translations that there is some hidden filter/killswitch that immediately stops the generation of the opening of some

I just discovered when playing around with translations that there is some hidden filter/killswitch that immediately stops the generation of the opening of some books. It doesn't matter if the invoking prompt is to recite the book opening paragraph, or to translate it from a foreign language to English, or what. It's not RLHF induced because it works via API and it only triggers in English, but sure enough try to get it to output >Call me Ishmael. Some years ago— >"It was the best of times, I guess this might get you flagged (there is no alert to the user that this filter kicked in, and it will output it in any other language, and it works in the API) so I'm hesitant to play around with it more, but it's very strange - especially as these are long since in the public domain.