I don't know untill it happens to me. We are still on old laws but thanks for sharing. This is one case when I would learn from other people's experience. Knowing this know, I would try and either be quicker while the ball is still in the area or wait a bit longer if possible to make it a fairer dropped ball.
Having said that, the attacker having the ball on the edge and getting it back on the edge isn't that unfair unless he was being closely challenged when you stopped the game.
I just went with what seemed the least controversial option at the time. Even though it essentially robbed the attacking team possession of the ball in a promising area! Was considering asking the keeper to return it to the opposition but that’s not really for me to tell them that.
I think I got lucky tbh...on another day a team may have been very unhappy about my decision!