A spreader with the Mana Lens: Phantom doesn't seem to retarget between multiple spreaders in its path. See image for reference:

Expected behaviour:
The spreader with the lens fills up the first spreader in its path that is not full. Once full, move on to the next spreader that is not full.

Actual behaviour:
The spreader fills up the first spreader in its path that is not full and stops. If you remove and replace the lens, the spreader will retarget and start filling up the next spreader that is not full.

This is probably not the original intention when the phantom lens was designed, but it is the first thing I thought of when I learned of it. Mainly because the mana burst goes through filled up spreaders. If you are not gonna implement it this way, I'd suggest making the behaviour clear, by stopping the mana bursts at the first spreader.

On a side note, It does works as expected once all the spreaders in its path are full, most of the time. I think it's mainly when there is more than one spreader not full.

This is intended.