Cannon's Ready with Attack Projectiles

I've seen a lot of previous reports regarding Cannon's Ready on the Tactician tree not functioning with certain skills (notably Siege Cascade) but I have been building out a Molten Blast and Ancestral Warrior Totem build and having just completed my third ascendancy, it no longer functions.

The wording on Cannon's Ready is "Totem's only use skills when you fire an Attack Projectile" and Molten Blast has the keywords for Attack and Projectile. It does not specify requiring a specific weapon type.

Hopefully this is a bug and can be fixed as it kind of sucks sinking time and effort into a build to have it not function based on what the tooltip says.