[MC-64490] Unable to set beacon effects

In snapshot 14w31a beacon effects can't be applied.
Relevant console output attached.

Linked issues

Confirmed for 14w31a

Same Here

David Wheatley 2014-07-31T08:17:42Z

Yep. This is annoying...

Jacob Pettay 2014-07-31T22:09:38Z

Confirmed

Confirmed

Confirmed, can't use my shiny new beacon in my new world :S

SmashPortal 2014-08-03T01:49:46Z

Confirmed, was testing beacons below spawners to see if they'd still radiate effects. Couldn't get it to accept my emerald or diamond.

Joshua Fattarini 2014-08-03T22:43:52Z

Confirmed. Why does it say resolved? My Beacons are giving off light, but wont give any effects.

Dlawso the Really Lucky Rabbit 2014-08-03T22:44:36Z

Its resolved because its a dupe.

Joshua Fattarini 2014-08-03T22:49:45Z

Oh, okay I see it. I'm pretty new here.