Siege Cascade bug

Hey!
I've been playing Tactician, using the "Cannons, Ready!" Passive to proc ballista siege totems, which has been loads of fun. I've been using armor piercing rounds while leveling, but I was excited to switch over to Siege Cascade, since it would mean more cool explosions. However, for some reason, using siege cascade doesn't actually proc the totem's skill, even though the gem has the necessary tags for it to do so.

Anyone got any thoughts where I missed something, or is this a legit bug?

Hello, instead of making a new thread I want to plus on this guy's observation.

On top of Siege Cascade not triggering the "focus fire" on totems, it's also not following the description that says:

"These bolts lodge in the ground and explode after a short delay."

There is no explosion after a short delay.

Here's a breakdown of the Siege Cascade mechanics and where the bug is.

Description:
"Load your crossbow with enemy-seeking payloads which are fired into the air dropping a bolt near every enemy in the the target area. These bolts lodge in the ground and explode after a short delay"

Breakdown:
enemy seeking payload - working
bolt near every enemy in the the target area - it seems to be working but the area (4m) is too small
explode after a short delay - no working

Please fix or address, we could be wrong in our testing - this is a great skill that follows the playstyle envisioned by GGG, it requires a combo to clear a pack.

UPDATE:

Tested with urns in Crypt map.

Breakdown:
enemy seeking payload - working
bolt near every enemy in the the target area - working*
explode after a short delay - working
Cannons, Ready! - not working

working*it seems that the radius is not fixed.
based on testing - more than 12 urns we're all targeted but the urns were scattered beyond a 4 meter radius
in actual combat - some monsters are not targeted despite being within a 4 meter radius of the mouse pointer
OBSERVATION: the monsters were outside the 4 meter radius when I clicked on the skill (Siege Casade)
OBSERVATION: they were hit with the explosion but they were not assiged with their own projectile.
QUESTION: is the 4 meter radius locked when the projectiles fly or when they drop?