When Wizard’s teleport skill with wormhole rune is used and you have the Aether Walker effect enabled, you won’t be allowed to recast teleport a second time when you run out of mana despite the recast being used for free.
Notes: Aether Walker is equipped inside the Kanai’s Cube and not on the character themself.
I’m not sure this is a bug and I’m not familiar with Wizards. But, the way it looks to me is:
Teleport/Wormhole has no Resource cost. It has a Cooldown and says when you cast Teleport you have 3 seconds to cast it 1 additional time.
However, Aether Walker removes the Cooldown and costs 25 Arcane Power instead. So, this may be nullifying the Wormhole effect.
You might want to move this thread to the Wizard Forum. If the veteran Wizards there can confirm this is a bug, then you can move it back here. If they confirm it is not a bug, then they can explain it better than I can.
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It has to do with the interaction between Aether Walker and Wormhole.
Aether Walker makes Teleport cost 25 Arcane Power. Wormhole gives you a second teleport. The combination of Aether Walker + Wormhole means that the first teleport costs 25 Arcane Power and then the second teleport from Wormhole is free.
However, despite the second teleport being free, the bug is that you are only able to cast the second teleport from Wormhole if you have sufficient Arcane Power. Even though it doesn’t actually consume Arcane Power.
The bug is probably in the order things are checked, i.e. it first checks that you have Aether Walker equipped, then checks that you have sufficient Arcane Power, then checks that it’s the second teleport from the Wormhole rune, so should be free. The check for ‘second teleport from Wormhole rune’ probably just needs to happen before the check for ‘enough Arcane Power for Aether Walker’.
The bug has existed ever since Aether Walker has though (at least as far as I can remember), and I’m not holding my breath for a fix. Doesn’t seem high on the priority list.
Doesn’t matter, it happens regardless of whether Aether Walker is equipped or cubed. It also happens if Wormhole is conferred via Cosmic Strand instead of via the rune on your bar.