Leyline of Combustion bug [Fixed]

Leyline of combustion should deal 3 damage to my opponent every time he casts a spell or activates a Vanguard ability. It works fine when the opponent casts a spell but it doesn’t do anything when he activates a Vanguard ability

IV noticed this to, only a couple of times with narset mostly with vanguards and once with a spell wich confused me

This issue is now under investigation.
Thank you for the feedback.