tree appears a flower with a green piece stuck on the flower never seen in the world

there is a bug about when have a tree and bon meal the tree grow up and same for bon metal, the tree  is Borneo but contain this flower always never seen in the game

How to reproduce

1. get a tree
2. wait the tree to born or use bon meal
3. if see near at tree where is  leaft blocks you will see a flower with a green piece stuck with the flower and never seen it in the nature

Expected Results 
The flower should not spawn in the tree with a green piece stuck with the flower

Observed Results
The flower always spawn with green piece when the tree is born

The first player in the photo demostrate this strange flower