Custom Directive in side ion-nav-bar calls 2 time for single page after beta.14

I have crated custom directive in ion-nav-bar. Now when page load link function on my directive calls two times instead of one. This issue start after upgrade to beta.14. On beta.13 it was working fine.

Here I have created code pen for demo.

You can check JS console log. Log prints 2 times.

Please help to overcome this issue.