My point being, that 4-4 with 6-3 enclosure is not safe, since 3-3 invasion can still live. Either by utilizing outside strength to make a living shape outright, or by creating and winning the ko (and if there are not enough ko threats for winning the ko, its usually a mistake to invade 3-3)
But also keep in mind that a Ko is worth something. Simplified you either win the Ko and get the corner, or you get the privilege to play two moves somewhere else. This can be used to safe a otherwise dead group.
Your opponent will likely chose the more valuable option, but you get at least something out of it if you invade at the right time.
Got this from an actual game it originated from 3-3 invasion of a 4-4 point with small knight extension and according to sensei library and joseki library it should die as its a type of L group in the corner.
So either I goofed or it can truly live. I have been trying to kill for 48h now and cannot find a way. Can anyone confirm this?