Title - you can esc > confirm unlimited number of times and be allowed to continue selecting knowledge points.
I am unsure about this one. I received a KP, went it, selected one of the Skills (specifically Tools of War), hit ESC, received the Confirmation Button, Selected Confirm, and exited back to the game. Now the Game HUD shows 1 point still to spend, but inside the Tree there are no available points to spend. And clicking on any skills doesn’t add the points to that specific skill.
We cannot reproduce this. Have you tried verifying game files/removed any mods?