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instabreak of blocks (rare occurrance)

Instant death when boat hits mob

Creepers Explode Instantly

Sticky piston pulses when redstone signal strength changes (in special cases)

merged TNT Minecarts explode instantly when hitting a block even if it was already activated

Mobs Instantly Die After Falling From a Lead.

Retracting piston deletes ANY block in the place the head should be.

Tipped arrows with instant effects don't apply effect

no longer instant oxygen regenerated