doing a glitch in Super Mario 64 I randomly just found

the backstory time yay so I was about to do a Bowser kill but then I was doing some random stuff on top of the castle and then I ended up just falling through the second part of the castle after the part u can jump onto and doing a side flip or jumping through the back and doing I usually don't do that when I want to get some more height in the castle like fly above and look around admiring The view but then I just randomly did that so all right new glitch or something I don't know probably old