Peony drops 2 more peonies, allowing peony duplication

Running Nexus 7
I am playing 0.16.0 beta and while walking around in Survival mode I broke a peony and I saw that I was given 2 in return. I planted another and it did the same. Just thought I should report it. Also I have a question: why is the beta version 0.15.9.0 instead of the usual "[next version] beta"?