Prankster under Trick Room

Hi Guys, I recently had a match where I was in a match with my Whimsicott and Lucario against Oranguru and Torkoal, trick room was already set the turn before and this turn I wanted to use endeavor with Whimsicott on Torkoal, but somehow Torkoal used Eruption before my Endeavor.

Am I misunderstanding something? Does prankster not work under trick room? Or is Endeavor considered an attack instead of a status move? Or is this a weird bug?