Grandsolfachord Coolio

[Lyris]

@Clear Wing Synchro Dragon

1 Tuner + 1+ non-Tuner monsters
Once per turn, when another Level 5 or higher monster activates its effect on the field (Quick Effect): You can negate the activation, and if you do, destroy it. Once per turn, when a monster effect is activated that targets 1 Level 5 or higher monster on the field (and no other cards) (Quick Effect): You can negate the activation, and if you do, destroy it. If this card’s effect destroys a monster, this card gains ATK equal to the destroyed monster’s original ATK until the end of this turn.

@A_Dragon_s_Soul

Did they negate the activation of that monster’s effect? If so that is not a bug, it prevents their activated effects from being negated (which would stop something like Imperm or Therion Regulus), but not the activation of the effect itself from being negated (Apollousa, Baron as examples there).