People are repording it on ships with distingt citadel layout.    Basically ships whose turtleback armor is not connected to citadel sides.Turtleback is part of casemate armor zone. What happened do those ships before the update, was that you could deal cit-damage, but you were not awarded cit-ribbon.Because turtleback is part of casemat armor and is only connected to the citadel armor hitbox on the roof.So in order to penetrate citadel, you had to overpenetrate casemat armor first.And ribbon was only awarded on the basis that what shell did first ( so, and overpenetration. So you got overpenetration ribbon, but caused citadel damage.   Now it is possible that with that "how shell interacts with armor" they fixed it. And now we are awarded ribbons on the basis that what shell eventully did.   Basically nothing have changed. We still do same amounts of damage, but we now are reciving correct amount of cit-ribbons.This is also the reason why many players have not seen any difference.And why WG have seen increase of citadels, but not in anything else.   Amagi and Bayern also have turtleback, but hittable part is mostly connected directly to citadel. So on those, we have always recived correct amount of cit-ribbons and people are not complaning about them either.