Safari issue : $scope.accordionA.expand(index) does not always show the content

[Gunner17]

When I manually try to expand an accordion pane using :

$scope.accordionA.expand(index);

It works perfectly fine in Chrome and displays the pane content.
But in Safari, although the pane appears to be selected(with highlight and minus sign on the rightmost side), the content of the pane does not show up at all!!

Has anyone ever faced this issue?

System configuration :

OSX : macOs Sierra
Safari version : Version 10.0.1