There is a little workaround if you didn't know. Put powerfull attraction on your class item & either dodge, pop a rift or put down a barricade depending on what character your on over or close to the motes, it will pick them up. It does work even though it was designed for orb collection.
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And if they're under the map, assuming they're close enough to the surface, you can crouch on top of them and that'll also pick them up.