King Groot power drain immune not working?

Just took King Groot into Act 6.1.5 (Crossbones boss). The general node (Power Struggle) makes it so you gain 1 bar of power when you opponent gains one aswell, but you don't get power through normal means. When the opponent uses their power it drains your power for an equal amount.
But King Groot has it listed in his abilities he is immune to bleed, power drain and power burn. So how come he gets his power drains in this quest?
But King Groot has it listed in his abilities he is immune to bleed, power drain and power burn. So how come he gets his power drains in this quest?
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