False Positive for Rails/ActionControllerFlashBeforeRender when flash is called in a case statement

[ccutrer]

Expected behavior

When flash is set in a case statement, followed by a redirect_to, the cop should not register an offense.

Actual behavior

Offenses:

app/controllers/context_controller.rb:262:11: C: Rails/ActionControllerFlashBeforeRender: Use flash.now before render.
          flash[:error] = t("no_user.course", "That user does not exist or is not currently a member of this course")
          ^^^^^
app/controllers/context_controller.rb:264:11: C: Rails/ActionControllerFlashBeforeRender: Use flash.now before render.
          flash[:error] = t("no_user.group", "That user does not exist or is not currently a member of this group")
          ^^^^^

Steps to reproduce the problem

      unless @user
        case @context
        when Course
          flash[:error] = t("no_user.course", "That user does not exist or is not currently a member of this course")
        when Group
          flash[:error] = t("no_user.group", "That user does not exist or is not currently a member of this group")
        end
        redirect_to named_context_url(@context, :context_users_url)
        return
      end

RuboCop version

% rubocop -V
1.61.0 (using Parser 3.3.0.5, rubocop-ast 1.31.1, running on ruby 3.1.3) [arm64-darwin21]
  - rubocop-factory_bot 2.25.1
  - rubocop-graphql 1.5.0
  - rubocop-performance 1.20.2
  - rubocop-rails 2.23.1
  - rubocop-rake 0.6.0
  - rubocop-rspec 2.27.0```