I wasn't signed in on all the browsers I tried, so signing in an out wouldn't help. The problem wasn't on my end, as I and the error explained. It seems to have been fixed now anyway, so I guess someone noticed who could fix it, if this wasn't passed to the right people already.
Visual Studio Developer Community website returns 500 error
Trying to view a specific item or just any items by browsing produces a 500 error in some fashion.
Clearly this is not useful or the intended behaviour, and the queried feedback items should be shown.
The service status says 'Healthy' at https://status.visualstudio.microsoft.com/status, but I've tried multiple devices and browsers and it just gives the same error 500, an internal server error, so has nothing to do with my cookies, cache or browser - it's a problem on the server side.
Not sure if there is a better place to report it, other than https://developercommunity.visualstudio.com/, which clearly isn't an option.