It is really annoying, that whenever i swipe up on my iPad to close Goodnotes, it also scrolls up the document. Please improve your touch detection to dismiss such swipes, so the document stays in place.
You see this issues in the attached screen recording, where the "I am here" text will scroll up when the dock gets shown through the swipe up from the very bottom of the screen action. It will also scroll the document further, when i move my finger further up to reveal all application windows.