Boss ward not triggered by reflected dmg

Other types of damage can trigger boss ward when its HP is reduced to a threshold but reflected dmg didn’t.
Is this a bug or is it supposed to be like this?

P.S.:
A. If a boss’s HP is reduced to the threshold by reflected damage, there would a visual effect on HP bar, but no ward comes after that, even if I deal other types of damage to the boss later.
B. If a boss’s HP is reduced to the threshold by other types of damage, there would a visual effect on HP bar, and then ward is generated.

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