Fire Exposure Support gem cannot be equipped on Hellhound for Infernalist

As the title says, the Fire Exposure support gem cannot be socketed into the Hellhound minion from the Infernalist ascendancy class despite being able to be socketed on any other minion skill. What leads me to believe this is a bug is the fact that hellhound doesn't even show up on the "supportable skills" screen when hovering over Fire Exposure in my inventory.

Fire Exposure CAN be combo'd with Infernal Legion support gem that has the same effect as the hellhound, which is the third reason I believe this to be a bug.

If this is to balance the fact that the Hellhound does not lost life per second from the immolation aura it provides, then at least put an "x" next to it on the supportable skill screen when hovering over the gem in the inventory instead of having it missing from the list entirely.

I'm not facing this issue on my side. I have my Hellhound linked to Fire Exposure.

Forgot this thread was still up, it did get hotfixed that night, not sure how to delete threads sorry