Steps to reproduce (You can swap the leaves, it'll work the same way):
Place Dark Oak Leaves on the ground
Remove it from the inventory
Pick Acacia Leaves and put it somewhere in your inventory (not in your hand)
Pickblock the previously placed block
What should happen:
The dark oak leaves are properly picked as any other block.
What atually happens:
The acacia leaves are put in your hand and the name "Dark Oak Leaves" is displayed above.
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