What specifically is happening when this skill triggers?
The plugin makes some changes to how an action is applied to a target (namely, it checks for a parry after it checks for a block, which it does after the miss chance is checked), so it's possible that your effect is triggering when a parry (or block) has happened. You could add some extra checks like if (this.result.isBlocked() || this.result.isParried()) and then do the rest of it.
Nothing in those note tags should be affected by my plugin though, select effects and deselect effects have been thoroughly tested, as the block chance plugin uses them to cause the block effect.
~Ramza