Hlint gets confused by `import Prelude ()`

$ hlint --version
HLint v2.1.1, (C) Neil Mitchell 2006-2018

This seems to affect custom hints that don't use anything from Prelude (such as the wibble example in the defaults) as well.

Test1.hs

module Test where

import Prelude ()

f = concat $ map (+1) [1]

$ hlint Test.hs
No hints

But it's fine if NoImplicitPrelude is used instead

Test2.hs

{-# LANGUAGE NoImplicitPrelude #-}
module Test where

f = concat $ map (+1) [1]

$ hlint Test2.hs
Test2.hs:4:5: Warning: Use concatMap
Found:
  concat $ map (+ 1) [1]
Why not:
  concatMap (+ 1) [1]

1 hint

Reproduce the issue with the provided Test1.hs and Test2.hs examples, then trace how HLint handles import Prelude () versus NoImplicitPrelude. Done means the same applicable hints, including concatMap, are reported when Prelude is explicitly imported empty.