Bytes flag causes Map.! error

[MartinSStewart]

Quick Summary:
Running lamdera make Generate.elm on the following code will trigger a

lamdera: Map.!: given key is not an element in the map
CallStack (from HasCallStack):
  error, called at libraries/containers/containers/src/Data/Map/Internal.hs:633:17 in containers-0.6.5.1:Data.Map.Internal

error.

The error goes away if I switch the flags from Bytes to String. I would expect bytes to be supported in Lamdera since you can pass bytes through ports in Lamdera.

SSCCE

module Generate exposing (main)

{-| -}

import Bytes exposing (Bytes)


main : Program Bytes () ()
main =
    Platform.worker
        { init =
            \flags ->
                ( ()
                , Cmd.none
                )
        , update =
            \_ model ->
                ( model, Cmd.none )
        , subscriptions = \_ -> Sub.none
        }