When placing any types of heads on any block it will not cause the block to update. However, it will update when you break the head.
Reproducable by placing still sand (use MCEdit) and then placing heads on top.
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migrated
migrated
Confirmed in 13w22a.
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Yes, it is.
Skylinerw
Still occurs in 14w11b.
migrated
Still occurs in 1.7.10, 14w28b, and 14w29b. Also applies to cocoa beans.
I note that most other items that place blocks pass 3 as the last parameter to the method that actually places the block in the world, while skulls and cocoa beans pass 2. And looking into that function, it appears that bit 0 clear does specifically prevent the place-block method from triggering an update.
Door items also pass 2 to that method, but they trigger updates "manually" immediately after placing the door-blocks into the world.
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Fixed in 14w31a
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Confirmed fixed.