Mod Description:
"While Charged with Light, regain half of your melee energy when you use a charged melee ability, consuming one stack of Charged with Light."
I was trying out new builds with my titan and found that while using my Stasis melee, a stack of Charged with Light would be consumed, but my melee wouldn't get the energy back. I tested it with the other subclasses, and it worked on them.
Since the stack is still being consumed, I assume its just a minor coding error. If you want to try it out yourself, remember that Heavy Handed is an Arc mod.
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I have experienced the same thing with the Warlock melee