Weaver heal skill 'Aquatic Stance' does not trigger any 'when you use a heal skill' effects of runes

[SixJish.7038]

Upon activating Aquatic Stance, 'when you use a heal skill' effects of runes are not triggered. My personal example was having six Superior Rune of the Revenant equipped on my Weaver, and activating Aquatic Stance (in combat), yet there was no resistance given, and not shown on the skill bar where other boons are shown. Other heal skills worked normally, only Aquatic Stance did not provide resistance. I know Aquatic Stance works on an 'ammo' system, but I don't see how that could be related.