If you look at a beacon that is placed next to other blocks, the sides of the diamond block that are adjacent to other blocks disappear.
Also placing a solid block above the beacon creates a texture bug at the obsidian part of the beacon.
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is duplicated by 12
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Confirmed to reoccur in snapshot 12w49a. Also, update this to work with only opaque full-sized blocks.
This happens because Minecraft is only rendering visible geometry, when the side of a block is covered it doesn't actually render that side of the block anymore because you can't see it.
Confirmed in 12w49a and added the texture bug from MC-3908.
same for me in 1.4.7
fixed in 13wsnapshot due to different texture system
@adam: No, it's not (see screenshot-2.jpg)
?! I tested it. Both blocks were fine.

@adam: can confirm in 13w02b, please attach screenshot of your setup
theres nothing wrong with this? I think.

Place a solid block besides or ontop the beacon. In your screenshot there are two beacons besides - both are transparent
ah I see thanks it happens. maybe its because its 3D (internal diamond external glass) unlike other blocks
No. its because the same rendering code for blocks is being used for the beacon.
the diamond block in the centre either needs to be rendered manually, or the code for rendering blocks needs a way to override whether it renders sides of blocks against solid blocks.

Confirmed for 1.5.1 !

Confirmed for 13w16a !

Confirmed for 1.5.2 and 13w17a !

Confirmed for 13w18a ! (EDIT: and 13w18b+c !)

Confirmed for 13w19a !

Confirmed for 13w21a !

Confirmed for 13w22a !

Confirmed for 13w23a/b !

Confirmed for 13w24a/b !

Hmm, surprised this still exists. Definitely has to do with everything on each side being classed as the side, so it takes away the glass layer on the side, but also that side on the inside parts. I could see some attribute added where it is like "This part should never be hidden unless completely surrounded" or something, but that doesn't sound too easy to set up nicely. Possible, just... yeah.
I also think this is a good glitch that needs to be fixed put I found out in multiplayer if you but Beacons Anvils Chests Fences Heads Signs Glass Slabs or Cobwebs above beacons they wont have a glitch effect cause they I believe are un-solid blocks so this is a way to fix that if your making something and also Leaves sadly do not work with that.

Confirmed for 13w25a/b/c !
Fixed. Sadly tickets like these get lost in the 'pile of tickets'. 😞
Found it now! 😃

@Grum:
Thanks for fixing that 🙂
Yep, that "pile of tickets" still contains a lot of old issues with textures/graphics/rendering. MC-9553 for example is one of the most annoying ones (and about to reach the top 10 of the popular issues list), another one which bothers me is MC-7486 (not really visible with default textures, but indeed visible in many texturepacks). MC-190 was even community-fixed, so this one shouldn't be a lot of work.
Related to MC-86
Fixed in future version.