It seems vastly higher on every region and VPN I've tested, so I think this is a case of the "technicalies".
It is technically 20%, because a bunch of the requests that happen on page load do succeed. Just not the few crucial ones that are required for the page to load correctly - those return a 500 the vast supermajority of the time.
It is technically 20%, because a bunch of the requests that happen on page load do succeed. Just not the few crucial ones that are required for the page to load correctly - those return a 500 the vast supermajority of the time.