Rails/WithIndex False positive

[Tietew]

When each_with_object is used with multiplex assignment:

def make_field_name_map(model)
  model.attribute_names.each_with_object({}) { |name, hash|
    hash[name] = hash[name.humanize] = hash[model.human_attribute_name(name)] = name.to_sym
  }
end

Expected behavior

No offences.

Actual behavior

Rubocop detects Rails/WithIndex offence:

test.rb:2:3: C: Rails/IndexWith: Prefer index_with over each_with_object.
  model.attribute_names.each_with_object({}) { |name, hash| ...
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Autocorrect breaks code:

def make_field_name_map(model)
  model.attribute_names.index_with { |name|
    hash[name.humanize] = hash[model.human_attribute_name(name)] = name.to_sym
  }
end

RuboCop version

$ be rubocop -V
0.90.0 (using Parser 2.7.1.4, rubocop-ast 0.3.0, running on ruby 2.6.6 x86_64-linux)
$ grep rails Gemfile.lock
    rubocop-rails (2.8.0)