"functions" does not match qualified function names

Example rule in .hlint.yaml:

- functions:
  - {name: Data.List.nub, within: []}
  - {name: L.nub, within: []}
  - {name: nub, within: []}

Example code:

module Main (main) where

main :: IO ()
main = print $ nub [1, 1, 2, 2]

Running hlint on this program detects the use of the banned function nub. However, hlint fails to detect the use in the following program (which references nub using the qualified form L.hub):

module Main (main) where

import qualified Data.List as L

main :: IO ()
main = print $ L.nub [1, 1, 2, 2]

I'm using version 2.1.9 of hlint:

$ hlint --version
HLint v2.1.9, (C) Neil Mitchell 2006-2018

Is this expected behaviour?

Start with the .hlint.yaml rule and the two Haskell examples in the issue, then run HLint against each program to reproduce the difference between unqualified nub and qualified L.nub. Done means the functions rule consistently detects the qualified use named by its module alias.