A slight bug! Put redstone on the ground, add a block and on the top a redstone lamp. With redstone torch, click on the redstone on the ground. (see image)
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qmagnet
Confirmed for 14w31a.
If block is placed at eye level, and half block type (dust, slab, repeater) is place at feet height adjacent, torches can be placed above half block, but block update will pop them off.
qmagnet
Actually this is the same bug as MC-58740 (not relates to). The only reason it is different for redstone torches, is because they update and fly off. Same bug though.