Hello again, and thank you for reporting that!
But I would need a bit more details on how the bug occured in order to track it down. You said it's when the player pick up an event again (after having thrown it, I guesss), and then when it move/transition..? (not sure what you mean by that...)
"Make an event that was throwable not" Do you mean that you can't pick it up again after you thrown it once? If so, no need for a 'call', you only need to switch the event to another page that doesn't have the <pickup event> tag.