Rails/ReversibleMigrationMethodDefinition false positive?

[coding-bunny]

Expected behavior

I expect the Cop to not flag a correct migration as "wrong"

Actual behavior

The cop is currently flagging all migrations

Steps to reproduce the problem

# frozen_string_literal: true

# This migration removes the ActiveStorage Blob tables.
class RemoveActiveStorageBlobs < ::ActiveRecord::Migration[6.1]
  # Runs the migration in the correct direction
  def change
    drop_table :active_storage_blobs do |t|
      t.string :key, null: false
      t.string :filename, null: false
      t.string :content_type
      t.text :metadata
      t.bigint :byte_size, null: false
      t.string :checksum, null: false
      t.datetime :created_at, null: false
      t.index :key, unique: true
    end
  end
end

This is currently flagged:

db/migrate/20210513071056_remove_active_storage_blobs.rb:4:1: E: Rails/ReversibleMigrationMethodDefinition: Migrations must contain either a change method, or both an up and a down method.
class RemoveActiveStorageBlobs < ::ActiveRecord::Migration[6.1] ...
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

RuboCop version

Include the output of rubocop -V or bundle exec rubocop -V if using Bundler. Here's an example:
You can see extension cop versions (e.g. rubocop-rails, rubocop-performance, and others) output by rubocop -V,
include them as well. Here's an example:

➜  customink_international git:(coding-bunny/bump_inkycop) ✗ bundle exec rubocop -V
1.14.0 (using Parser 3.0.1.1, rubocop-ast 1.5.0, running on ruby 3.0.0 x86_64-linux)
  - rubocop-performance 1.11.3
  - rubocop-rails 2.10.1
  - rubocop-rake 0.5.1
  - rubocop-rspec 2.3.0