When you crouch and place a Fence on the side of a Block and the try to walk on it you will fall trough the fence.
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duplicates 1
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Dupe of MC-11242.
MC-70017
Falling through fence if placed on side of a Block while crouching
Resolved
Duplicate
0
Robert
(Unassigned)
Community Consensus
Minecraft 1.8-pre3
Retrieved
Confirmed, but not particularly relevant. It's because you are within the hitbox as you place it.