[fixed/close]Silumgar, the Drifting Death only triggers once

[Nexhro]

Describe the Bug:
When multiple dragons controlled by Silumgar, the Drifting Death's controller attack, Silumgar's triggered ability only triggers once.

Which card did behave improperly ?
Silumgar, the Drifting Death

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
BfZ, Duel

What exactly should be the correct behavior/interaction ?
When multiple dragons controlled by Silumgar, the Drifting Death's controller attack, Silumgar's triggered ability triggers once for each attacking dragon.

Are any other cards possibly affected by this bug ?
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[Korath]

Duplicate.