To replicate it, place a block and stand right against it (as if you want to walk through the block. When placing a new block adjacent to the block you're standing against, the new block dissapears.

The bug:

https://www.youtube.com/watch?v=TKVL1R5C-Nw

-Works in both creative and survival
-The bug does not want to be replicated all the time. So there is another factor at play. Keep walking around and trying to replicate until it works. As soon as you get the bug, it will not disappear for some time.

May relate to: https://bugs.mojang.com/browse/MC-58153 (or may be a duplicate, not sure. If so, I'm sorry)