Elemental Expression - Bugged Support Gems

Elemental Expression (The skill granted by invoker) doesn't seem to be functional with a handful of support gems that can be attached to it. I think the issue may be with the spell tag. The skill has the spell tag, but it appears spell supports are not working.

I have only tested arcane surge and wildshards so far, but neither support gem is functional despite being socketable on the skill.

If I had to guess, I think the issue may be that the skill itself has the Spell tag, but the sub-skills do not.

I think this is something that needs to be fixed for the skill to be playable, and it will definitely frustrate players since Spell support gems are socketable onto the skill.

I can't even use uncut support skill gems to see what supportgems i can socket it with, the 3 or 4 i've tried with i haven't even been able to socket them into the skill.