DuplicateRecordFields fails compilation depending on the order of declarations

Summary

Builds with ghc 8.6.5:

{-# LANGUAGE DuplicateRecordFields #-}
main = return ()
newtype Record a = Record { f :: a -> a }
class C a where f :: a -> a

But flipping the order of the declarations

{-# LANGUAGE DuplicateRecordFields #-}
main = return ()
class C a where f :: a -> a
newtype Record a = Record { f :: a -> a }

gives

test2.hs:4:29: error:
    Multiple declarations of ‘f’
    Declared at: test2.hs:3:17
                 test2.hs:4:29
  |
4 | newtype Record a = Record { f :: a -> a }
  |                             ^

I guess this is a bug, but what is the expected behavior?

How to reproduce

Just invoke GHC passing the source-code file.

$ ghc test2.hs

Expected behavior

Both code snippets should either fail or succeed to build.

Environment

• GHC version used: 8.10.1, 8.6.5
• Operating System: nixos
• System Architecture: x86_64