00:15.653
I know what you're talking about and its only happened to me like 10 times ever. I think its a pixel perfect super jump off the first book but you can also do the same to anything else although I haven't done it in any actual runs and its not consistent. But yeah I think the super jump with the book at the beginning is going to be the only way to get sub 15 now.
It just happened to me again and I decided to clip it. Still no idea what causes it but it happens once in a while. and it does appear to be pixel perfect on the edge.
https://clips.twitch.tv/AmericanSlipperyGoshawkOSfrog
I think you should keep it because it would make things more interesting for Speedrunners. I don't think it would happen enough to normal players to really be an annoyance and cause any harm. But also if you remove it I'll just keep playing on the vanilla version for the sake of faster times in the future. You could remove it and have the removed and non removed versions both available but honestly I don't think its that big of a deal for the general public that will play this game. And for Speedrunners it seems to be the next big key to getting crazy times so I ask that you keep it please.