As designed Prefix description container has different border radius.

This is intentional, and it isn't really much different from the border radius being different on the resource body itself (or any other page with standalone tabs, such as the "What's new" pages).
 
and it isn't really much different from the border radius being different on the resource body itself
This is true, but it's about context. In the example I have given both containers have the same dimensions and so are directly comparable.

But if you compare the tab bar with a large container such as a resource or list of new posts, then any difference doesn't slap you round the face as you don't directly compare.

No big deal though, no doubt I can change it myself - I only mentioned it as a bit of seemingly inconsistent design that looked to me like a bug..
 
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