According to Dinnerbone, the main hand, while holding a sword, has no "use" function while there is an object in the off-hand. This is not true when the off-hand is holding a sword.
MC-83360
Sword in main hand is still used as "block" while there is a sword in the off-hand.
Resolved
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As Dinnerbone said:
"Melee combat changes. Melee combat will change, just not in this snapshot."