There is a glitch in the birthday bash to somehow camp inside the cyan notebook classroom even if Baldi spots you or hears you. What are the odds of this happening and how does this happen?

This was also a case for the principal because he took a while before entering means he actually forget where i am.

100% chance, No idea how it happens

In classic 1.4, it just works as a unsafe place but in birthday bash, it’s a safe place for some time because Baldi might check again.