Bug with 'Lighting Spear'

All of sudden, 'Lighting Spear' is not showing up on my skill list.

I tried using other skill gems (lower level) and then it shows up for the first time

but then if I change its slot position, it is also not showing up.


I am on 'Lighting Spear' build but I can't use this skill?

What kind of stupid bug is this?

This is a known (but not fixed yet) bug. Does the skill also only shows "This information is currently not available" (like in Lightning spear stopped working)?
Try to remove the skill from the gem menu and reload your character.
Then you can try again to activate the skill OR you need to create a new skill gem (and use a lesser/greater/perfect jeweller's orb to get the 3, 4 or 5 support slots).