Hey All - Checking in here to acknowledge we are aware of this.
Unfortunately, it seems as though unpkg.com is experiencing some intermittent downtime which is triggering some of those 502 and 520 errors when loading certain unpkg assets. I would recommend following their live updates here to stay posted on any fixes or resolutions as they work towards one with their CDN provider.
We hope this will be resolved quickly - unpkg powers a lot of dependancies across the internet, so I am confident they are working as fast as they can to resolve things.