Hi, I recently bought 3 jungle saplings and i took them home but when i broke all the leaves even with a effeciency 3 block i didnt get any saplings from them.
Jungle leaves is a very low chance to get saplings from. The lowest of all the trees. I guess you just didn't have any luck that time.
Tip: make a 2x2 jungle trees (4 saplings) if you're tree/sapling farming. And also, be aware of CLAG (Clear LAG), it eats items in the ground every few minutes.
The rate is 20/100 to get a sapling, it's not worth it to actually make them separately, get 4 and make a big jungle tree, more wood and higher chance of more saplings.