After iOS 14 update, Hamburger Menu is not displaying

Why Hamburger Menu is not displaying in few websites, after iOS 14 update?
Still the same with 14.3. We are able to click it, but cannot see it. The websites working fine in all other devices. It is also working in iOS 13.x iPhones. Please let us know if there is any bug with the iOS 14.x to display the menu icon. There is no code changes done in the website. Thanks.
Please provide the URL of a site where this reproduces.
stage.loyaltygateway.com/rewards/phoenix/accolade_demo
Just did some analysis and identified box-shadow is not working in iOS 14.x for the website. Could you please provide an update based on this?
This is a known issue (webkit.org/b/216690) that will be fixed in a future OS update. You could work around it by not using box-shadow to render the hamburger menu.
Thanks. That helps. Is there any possibility to get the notification once it is fixed?
After iOS 14 update, Hamburger Menu is not displaying
 
 
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