Copy to Database Creating Separate New Topic, Not Integrating With Existing Topic [A9]

It seems that posting a topic and then copying to database will create a duplicate topic in the forum, rather than integrate the page record into the existing topic.

The top forum topic item there is the original, which I copied to make the article (which created the bottom forum item in the image above there).

My AdminCP options are exactly the same as in V4, so there shouldn’t be anything weird going on from that side of things:

I actually just tried to replicate the steps in order to full screenshot every step, but when I copy-to-database’d a brand new original topic and hit ‘Save’ on the post editor, I received this error message instead:

OutOfRangeException: (0)

#0 /var/www/html/5000014/applications/cms/modules/front/database/topic.php(320): IPS\Patterns\ActiveRecord::load(16)

#1 /var/www/html/5000014/system/Dispatcher/Controller.php(128): IPS\cms\modules\front\database\topic->form()

#2 /var/www/html/5000014/applications/cms/modules/front/database/topic.php(84): IPS\Dispatcher\Controller->execute()

#3 /var/www/html/5000014/system/Dispatcher/Dispatcher.php(169): IPS\cms\modules\front\database\topic->execute()

#4 /var/www/html/5000014/index.php(16): IPS\Dispatcher->run()

#5 {main}

Not sure what’s going on there, but the duplication of topics is definitely not expected behaviour.