I just experienced a bug (while doing Awakening the Machine weekly quest) on enhancement shaman, where casting a spell would not remove Maelstrom Weapon stacks.
Not sure if it is related to ‘awakening’ event though, it happened at the end on wave 17 I think.
Result was that I could use infinite amount of spenders, and MSW stacks would always remain at 10.
Infinite power lol.
When I returned to town, bug persisted.
MSW stacks were only removed when they timed out naturally.
Anyone else experienced this? I wonder what triggered it.
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We could have been great for a week or 2, ow we got snitched! 
I had the same “problem” during my normal Undermine run.
What do you mean?
This bug does not help us at all.
When you are at 10 stacks and cannot spend them, you do not trigger anything that is related to spending MSW, like Legacy of the Frost Witch, Voltaic Blaze, does not count for Tempest.
It’s been long time without a fix…
I noticed that it goes away when MSW stacks expire, or when you use Primordial Storm.
Seems to happen in all sorts of random places like delves or awakening the machine. Never happened to me in open world or dungeon though.