Suggestbox suggestions not displayed when navigating using arrow keys

We have a suggestbox with approx. 50 suggestions. We are displaying a
scrollbar for the suggestbox using the following css

.suggestPopupContent{
height:auto;
width:auto !important;
max-width:400px;
max-height: 165px;
overflow-y: auto;
padding-right:18px;
}

Now when the user tries to navigate through the suggestions using the
Up/Down arrow key, the suggestions not within the current visible area
are not displayed.

Thanks in advance.

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