As stated in the title, this addresses the following issue:

• Fix Comments are duplicated during autocorrection by Style/AccessorGrouping #14370

The logic to prevent comments from being removed during autocorrect was introduced in the following change, so the bug likely dates back to that point:

• Preserve comments on Style/AccessorGrouping autocorrection #11063

When a method call does not have parentheses, its trailing comment appears to be associated with the last argument rather than the method call itself. As a result, it is possible for the end of the comment associated with send_node.last_argument to appear later in the source than the end of send_node itself.

Before submitting the PR make sure the following are checked:

• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.