When a block is placed above the void with no other blocks near the area of 0 0 0, it freezes for a second.
It seems to stop happening farther away it doesn't seem to do much frame drops. It seems to only happen when the block is surrounded on all 4 sides.
Here's a video showing the bug as explaining it is harder.
Update #1: It seems that pistons also do the same thing but they have weird activity (The same with hand placed blocks)
More videos:
A list of blocks where the lag spike doesn't happen:
Building Blocks
Glass, Colored Glass
Decorations: (Some of these blocks I'm testing over a sign to float above the air)
Torch, End Rod, Chest, Ladder, Fences, Iron Bars, Glass Panes, Vines, Enchanting Table, End Portal Frame, Ender Chest, Cobble Stone Walls, Anvils, Carpets, Slime Block, Bed, Flower Pot (Flower Pots Float?), Skulls, Banners.
Redstone
Sticky Piston, Piston, Lever, Redstone Torch, Trapdoors, Gates, Trip Wire Hook, Buttons, Trapped Chest, Daylight Detector, Hopper
Misc
Turtle Egg
Food
Cake
Brewing
Brewing Stand, Cauldron
These are all the blocks I could place without commands. Mostly they're the transparent ones. Weird that a Enchantment Table is here but not the Farmland or Path blocks. Is it because the Enchantment Table has a animated book on it and causes particles?
Related issues
duplicates
Comments
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But why does it only happen around X0 Z0? It doesn't happen anywhere else?
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I just tested something.
I created two worlds, both the same: A void world.
I then on one world, made a fill platform to stand on at 0 45 0. When breaking blocks I lagged like in all the examples.
On the second world, I did the same but farther away. No lag. I then filled a platform at 0 45 0 and tried breaking and placing a block. No lag.
There has to be something else going on here than "lighting updates"
Duplicate of MC-11571. This is caused by lighting updates.