The leaves which generate with Dark Oak trees are incorrectly named 'Acacia leaves' rather than 'Dark Oak leaves' due to them having an incorrect data value.
Linked issues
Comments 12
They have different data value than the "true" acacia leaves, so just the name is wrong. Trivial to fix.
This issue appears again in version 1.9 (snapshots 15w33c ~ 15w36d)
Relates link : MC-86391
Restored the other report to MC-86391.
Can confirm.