In 14w32a/b, when a beacon is placed on the bedrock-ceiling of the nether (with access to the sky), the beam appears in the beacon but is stopped/cut as seen in the first two pics below (the third to compare with previous versions).
Seems a graphical bug (128 blocks height limit in nether) the effects are still working correctly.
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It's different : the beam is here when the beacon is place in the nether, I clarified : only on the nether ceiling the beam is stopped, at 128 blocks (the previous MC versions let the beam appear on the ceiling).
I'm sorry, but the previous screens are taken in 32a. (the data are present). I verified, it does occur in 32a, I added a new legend to explain with this new screen, it's only here to compare.
Now related to MC-73406 (status open and unresolved...)
Duplicate of MC-4405