I play mostly on my Warlock, and was actually super excited to get our own version of the shard aspect this season. I can keep grenades up pretty easily, but melee energy is hard to come by. However, I've noticed while running my standard PvE loadout that if you're holding a sword while picking up Stasis shards, you don't get the melee energy back. I have not confirmed whether you get energy back for the heavy attack on the sword instead, but was curious if this was a bug?