A player controls Nephalia Academy, and is playing with their hand and the top card of their library revealed.
( https://scryfall.com/search?q=%28ora...rid&order=name ,
https://scryfall.com/search?q=%28ora...rid&order=name )

A spell or ability an opponent controls causes that player to discard 1 Quagnoth and nothing else.
Via their Nephalia Academy, that player reveals the Quagnoth
and puts it on top of their library instead of into their graveyard.
If nothing else happens in the meantime, will the Quagnoth's
triggered ability still return that Quagnoth to their hand?


I imagine WotC would want the answer to be no, due to
"What if the library was interacted with while the trigger was on the stack?",
but I can't think of anything in the comprehensive rules that
would stop it from returning in the situation I described:

701.8c specifies "without being revealed", and 603.2f specifies "at no time visible to all players".