This datapack removes sticks from the loot tables of all leaves, makes jungle sapling drops more common, and makes dark oak trees more likely to drop apples than oak trees.

There is now an option for Mangrove leaves to drop propagules. Just remove " (alt)" the file "mangrove_leaves (alt).json" and replace "mangrove_leaves.json" with it.
  Since mangroves have propagules on their leaves they have a much smaller chance of dropping than other saplings from leaves.
  (~30 per 1000 mangrove leaves vs ~50 per 1000 leaves with most other saplings)


Here's the link to the legacy version for 1.13 to 1.16