Placed torch on wall as is the usual operation, then was able to place floating torches by placing them on the sides and front of the wall torch. Floating torches broke if any block updated around it.
edit: duplicated in creative only when a block was next to space where floating torch appeared
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This issue is not fixed in 14w26b.
Steps to reproduce:
Place two blocks over each other
Place a torch on the floor in front of the little wall
Place a second torch by clicking on top of the first torch

In the same way, we can place torches on the transparent blocks and "non complete" blocks, i.e. : ice, glowstone, sea lantern, all the rails, pistons, levers, repeaters, comparators, plates, tripwires, trapdoors, buttons, glass panes, iron barriers, cactus, saplings, ladder, cobweb, chests, beacon, redstone, etc.

The issue exists in 14w26c

Confirmed in 14w27a.

Confirmed in 14w28a.

Confirmed in 14w28b

Confirmed for 14w29a as MC-62136 describes this bug in 14w29a

Confirmed in 14w30a/b

Confirmed in 14w30c

None of the torches showed on the images I uploaded is touching the wall.
Also, when you place a bed under a "glitchy" torch, a half of it brakes.