How to get arrow height

I want to get arrow height.
shape.getMasterShape().getXForm().getHeight().getValue()
But get arrow height is 0.0;
please give me the Correct api or the other way to get arrow height.
thanks.
arrow.zip (84.0 KB)

@Delaba

We have logged an investigation ticket as DIAGRAMJAVA-50662 in our issue tracking system for your requirements. We will let you know as soon as ticket is investigated and resolved. Please spare us little time.