Lint/AssignmentInCondition giving false positives in block-in-condition

[ccutrer]

The file in the reproduction steps section shouldn't report any errors for this linter.

Expected behavior

No offenses are shown for this code.

Actual behavior

rubocop --debug --only Lint/AssignmentInCondition -- test.rb

gives

For /Users/cody/src/inst-jobs: configuration from /Users/cody/src/inst-jobs/.rubocop.yml
configuration from /Users/cody/.gem/ruby/2.7.2/gems/rubocop-rails-2.12.2/config/default.yml
configuration from /Users/cody/.gem/ruby/2.7.2/gems/rubocop-rails-2.12.2/config/default.yml
Default configuration from /Users/cody/.gem/ruby/2.7.2/gems/rubocop-1.21.0/config/default.yml
configuration from /Users/cody/.gem/ruby/2.7.2/gems/rubocop-rake-0.6.0/config/default.yml
configuration from /Users/cody/.gem/ruby/2.7.2/gems/rubocop-rake-0.6.0/config/default.yml
configuration from /Users/cody/.gem/ruby/2.7.2/gems/rubocop-rspec-2.5.0/config/default.yml
configuration from /Users/cody/.gem/ruby/2.7.2/gems/rubocop-rspec-2.5.0/config/default.yml
Use parallel by default.
Running parallel inspection
Loading cache from /Users/cody/.cache/rubocop_cache/c6e7bb119f0c0f52ccd63d4e1409d8a6f230f3ab/62a2053d41eb97fee50d7702bbb1b9ef8ecff8a4/6c68e4455f826a7733bbff3337b441b66287c5af
Inspecting 1 file
Scanning /Users/cody/src/inst-jobs/test.rb
Loading cache from /Users/cody/.cache/rubocop_cache/c6e7bb119f0c0f52ccd63d4e1409d8a6f230f3ab/62a2053d41eb97fee50d7702bbb1b9ef8ecff8a4/6c68e4455f826a7733bbff3337b441b66287c5af
W

Offenses:

test.rb:2:42: W: Lint/AssignmentInCondition: Use == if you meant to do a comparison or wrap the expression in parentheses to indicate you meant to assign in a condition.
                              submission = @gradebook_importer_assignments[student.id][idx]
                                         ^
test.rb:6:51: W: Lint/AssignmentInCondition: Use == if you meant to do a comparison or wrap the expression in parentheses to indicate you meant to assign in a condition.
                              submission['grade'] = 'EX' if submission['grade'].to_s.casecmp('EX') == 0
                                                  ^
test.rb:7:41: W: Lint/AssignmentInCondition: Use == if you meant to do a comparison or wrap the expression in parentheses to indicate you meant to assign in a condition.
                              no_change = no_change_to_submission?(submission)
                                        ^
test.rb:9:92: W: Lint/AssignmentInCondition: Use == if you meant to do a comparison or wrap the expression in parentheses to indicate you meant to assign in a condition.
                              @warning_messages[:prevented_grading_ungradeable_submission] =
                                                                                           ^

1 file inspected, 4 offenses detected
Finished in 0.7389060000423342 seconds

Steps to reproduce the problem

test.rb:

indexes_to_delete << idx if readonly_assignment?(assignment) || @students.all? do |student|
                              submission = @gradebook_importer_assignments[student.id][idx]

                              # Have potentially mixed case excused in grade match case
                              # expectations for the compare so it doesn't look changed
                              submission['grade'] = 'EX' if submission['grade'].to_s.casecmp('EX') == 0
                              no_change = no_change_to_submission?(submission)

                              @warning_messages[:prevented_grading_ungradeable_submission] =
                                true if !submission['gradeable'] && !no_change

                              no_change || !submission['gradeable']
                            end

RuboCop version

1.21.0 (using Parser 3.0.2.0, rubocop-ast 1.11.0, running on ruby 2.7.2 x86_64-darwin20)
  - rubocop-rails 2.12.2
  - rubocop-rake 0.6.0
  - rubocop-rspec 2.5.0