multiple inclusion of helm dependency

Helm Chart A is a library chart and defines a template function f1

Chart B adds A as a dependency

Chart C adds both A and B as dependencies.

Requirement here is that App B can be deployed by itself, but App C needs B to be deployed as well.

Now A.tgz is present in C/charts as well as in B/charts directory.

In such case I have noticed that template function f1 from C/charts/A开发者_Go百科.tgz gets executed.

Are there any best practices for this situation?