On my NOID Optimara is a petiole that has forked into two separate petioles and are each supporting a healthy leaf! I just noticed this today and wish I had spotted the split sooner to track exactly what happened. I wonder if this is a genetics or culture related phenomenon. The plant is otherwise very healthy and is in bud.

Theory 1, Identical Twins: a petiole split into two, and each continued to grow separately.

Theory 2, Fraternal Twins: two neighboring petioles fused into one, grew a while together, and then split up again.

AVs never cease to amaze me.