I am not 100% sure if it leaked. All I know is something 'liked' a post in Amethyst that I did not recognize doing myself. And Amber was acting super buggy on my phone. It would pop up every time I try to use it. It was a huge pain just to post that my nsec got leaked. Then I wiped my phone for good measure. Amber is asynchronous so everything is a callback. I still use it, but I also swap out my nsec for fresh for privacy too. So at this point, I don't care if I loose my nsec. The PM messages would be nice to use but I don't use PMs for obvious reasons. I only use marmot or signal.