Imprecise source spans for erroneous flags in OPTIONS_GHC

If I say

{-# OPTIONS_GHC -this-doesnt-exist -neither-does-this #-}

module Bug where

I get

Bug.hs:1:16: error:
    unknown flag in  {-# OPTIONS_GHC #-} pragma: -this-doesnt-exist
  |
1 | {-# OPTIONS_GHC -this-doesnt-exist -neither-does-this #-}
  |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Bug.hs:1:16: error:
    unknown flag in  {-# OPTIONS_GHC #-} pragma: -neither-does-this
  |
1 | {-# OPTIONS_GHC -this-doesnt-exist -neither-does-this #-}
  |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Note that both errors have the same location and both caret-diagnostics show the whole list of flags.

Getting this wrong means that the errors get ordered unpredictably.