Volcano and Shockwave Totem

The volcano skill, in Primal casting, states an interaction with slam abilities, namely that it will increase the number of projectiles volleys.

When I use this skill in conjunction with the first Bear slam skill, I can see the volley of projectiles generated.

The skill Shockwave Totem has the Slam, and melee tags, similar to what the bear slam skill has.

The issue is that, when I generate a slam from the shockwave totem I do not see the same projectiles generation that I see when I use the bears slam skill.

Is this the correct functionality of the interaction between Volcano and Shockwave Totem?