Array is flattened when using positional or context variable

[Stadly]

Consider this input:

{
  "foo": [ 1, 2, 3 ]
}

The selector foo.["bar"] returns the expected:

[
  [ "bar" ],
  [ "bar" ],
  [ "bar" ]
]

If I slap on a positional (foo#$i.["bar"]) or context (foo@$e.["bar"]) variable, however, it returns this:

[
  "bar",
  "bar",
  "bar"
]

I don't think the addition of a positional or context variable should change the returned value in this case? You can try it out here: https://try.jsonata.org/zJVVISNd3