Why does Toedscruel ex's ability not stop Radiant Greninja when it is an effect of an attack?

In the past Toedscruel ex's ability has worked differently in client and has stopped Radiant Greninja's attack effect, however at the moment it does not prevent this effect from putting damage on pokemon with energy attached to them. Is this a bug or is this somehow working as intended now? because going by the ability text this shouldn't be happening.