When you place or break a block in Creative (haven't tested in Survival), there is a noticeable visual delay. The block is "there", it just doesn't appear for a second.
It seems to only happen with new blocks, and when I try to take a screenshot, it fixes itself.
I have uploaded a video to Twitch showing this bug: http://www.twitch.tv/thegreatfalro/c/4676817
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is duplicated by
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Also happens in survival, less common and a shorter delay

I believe this is a different issue than MC-858. In that, the block actually regenerates. This appears to be merely visual.

The same happens in SSP, and it is NOT a dupe of the linked bug.

I don't think it's a duplicate. When you place the block, it tooks effectively 1-2 seconds to appear (and sometimes do not appear at all). This is a new bug.

Indeed, I reviewed this issue before I acknowledged that 29b released.
This ticket has been marked as a duplicate of MC-62166, in favor of the more general or better information provided.

Alright, thank you. I agree that it's more or less the same issue.
Duplicate of MC-858