Style/TopLevelMethodDefinition misses methods declared after a class.

[nertzy]

See my gist for all relevant files and output.

Expected behavior

Style/TopLevelMethodDefinition should detect top-level methods regardless of where they appear in a file, including after a class definition.

Actual behavior

Describe here what actually happened.
Please use rubocop --debug when pasting rubocop output as it contains additional information.

Steps to reproduce the problem

Turn on the Style/TopLevelMethodDefinition cop:

Style/TopLevelMethodDefinition:
  Enabled: true

Run rubocop against the following file:

class One
  def two
    2
  end
end

def one
  1
end

The top-level method one will not get detected.

Note that the cop works if the method is the only contents of the file:

def one
  1
end

RuboCop version

❯ bundle exec rubocop -V
1.15.0 (using Parser 3.0.1.1, rubocop-ast 1.5.0, running on ruby 2.7.3 x86_64-darwin20)