This might not be a bug.
Not all morphs of skills that grant a shield count for Shield Master CP, for example. The devs explained that this was because they didn't count as shield abilities if the shield was "auxiliary." In those cases, the shield was only gained on one of the two morphs and wasn't present on the base morph.
Since the execute part of this ability is only present on the one morph, the skill as a whole (by analogy) is likely not considered an "execute ability."
This might not be a bug.
Not all morphs of skills that grant a shield count for Shield Master CP, for example. The devs explained that this was because they didn't count as shield abilities if the shield was "auxiliary." In those cases, the shield was only gained on one of the two morphs and wasn't present on the base morph.
Since the execute part of this ability is only present on the one morph, the skill as a whole (by analogy) is likely not considered an "execute ability."