I cannot reproduce this in single player, only on the realm I play on. When pillaring up on redstone ore the second ore you place disappears quickly after placing. It is not a problem to make horizontal rows of redstone ore, so I think the activation of the ore by the player standing on it must play a part in the bug, as well as some issue of lag or latency when playing on a realm.
I don't know if it is related to the issue of blocks disappearing when building at world height limit.
Linked issues
Comments 3
This happened to me too. Accept I was playing 1.1.3 and 1.1.4. Also I couldn't place any blocks on the redstone ore.
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However, this issue has been closed as a Duplicate of MCPE-21698.
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I've had this happen when placing any block where I'm apparently "too close" to place it. It looks like the block is placed for a split second then vanishes, and is no longer in your inventory.
This was on MCPE 1.0.4