aria-expanded not working as expected

I am using the weglot shortcode in my nav menu with 2 languages in a dropdown.

On page load the aside has these classes class="country-selector weglot-dropdown close_outside_click weglot-shortcode"
and aria-expanded="false"
When I click the <aside> the dropdown opens and a class of closed is added to the aside, and the aria-expanded remains false.

If I use tab navigation on page load, I navigate to the aside using tab and press enter, the dropdown appears and the aria-expanded does update to show true, but if I press enter again the dropdown closes, but the aria-expanded label remains true when it should say false.

This needs to be fixed for our site to pass accessibilty checks, thank you.

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