known issue Splitting posts into new topic causes them to disappear if first post is guest post

[TSP]

Steps to reproduce:

• Create a test topic in a forum where guests does NOT have permission to post new topics
• Reply with a test account, or temporarily allow guests to post topics and replies.
  • If you replied with a test account: delete the test account so the reply becomes a guest post
  • If you posted as a guest: remember to reset the forum permissions to once again disallow guest topics/replies
• As a moderator: select the reply and split it into a new topic in the same forum with your moderator tools
• You should be redirected to the new topic created by splitting the posts
  • Instead you'll get an error page: "You do not have permission to view this topic." (Error code: 2F173/K)

The reason is that the new topic is saved to the database with the approved column set to -3. Which in system/Content/Content.php is documented as:
"@li -3 is a post made by a guest using the "post before register" feature"

Please note that this will happen even if the system "Post before register" is disabled. It shouldn't happen in either cases.

Also; since there is no way to get a list of topics and replies hidden for this reason, it's not possible to save the topic from the interface, you'll have to manually fix it in the database. 

I think this happens because of the following code for the function createItem in system/Content/Item.php. 

I'm pretty sure you'll have to fix the logic for both the approved and hidden switch. 

<?php
	case 'approved':
		if ( $hidden === NULL )
		{
			if ( !$author->member_id and $container and !$container->can( 'add', $author, FALSE ) )
			{
				$val = -3;
			}
			else
			{
				$val = static::moderateNewItems( $author, $container ) ? 0 : 1;
			}
		}
		else
		{
			$val = \intval( !$hidden );
		}
		break;

	case 'hidden':
		if ( $hidden === NULL )
		{
			if ( !$author->member_id and $container and !$container->can( 'add', $author, FALSE ) )
			{
				$val = -3;
			}
			else
			{
				$val = static::moderateNewItems( $author, $container ) ? 1 : 0;
			}
		}
		else
		{
			$val = \intval( $hidden );
		}
		break;