I was trying to test out the new beacon in my nether fortress and i encountered some issues.
1: the beacon does not seem to activate unless there is a shaft leading all the way to the bedrock ceiling on top of it
2: the beacon will never emit light beams in the nether.
due to the way the nether differed from the over world and sky lands the beacon needs a different rule set for this dimension
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Voted. "2: the beacon will never emit light beams in the nether." <- This is not a bug though. Also what you wrote Arthur is not true. There is no need for direct view of the ceiling bedrock for beacon to function. It only needs 14 blocks of air above it.
Beacon has inconsistent behaviour in the nether. Particularly in fortresses or around them but not only. It's just more rare outside fortresses. The problem is that powers are not selectable as if there are no iron/gold/diamond/emerald blocks placed below it.
It is not very difficult to reproduce and confirm.
I ran into this problem in 1.8.2-pre6. I drilled up to bedrock in a 2x2 shaft. Three of the four beacons activated. The fourth would not let me select an ability.
When I went into creative mode and knocked out the bedrock above the broken beacon, there was a piece of netherrack about the bedrock. After I knocked away the concealed netherrack, the beacon immediately lit up.
The offending piece of netherrack was completely concealed by bedrock so there was no way to fix this in survival mode.
It does have that different rule, a beacon in overworld will only activate when it has air blocks all the way up to max height, in the Nether, it has to have direct view of the bedrock that is on top of the Nether.