Minecarts do not drop blocks into a powered hopper below the tracks.
Contacted MojangSupport through twiiter, didn't know if it was a bug, told me to report
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Duplicate of MC-7178 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
this is working as intended. If you power a hopper it becomes locked meaning nothing in, and nothing out until the power has been removed