Is the automatic direction change broken in the paginator for the latest Cake 3 release?

my index method has the following baked code.

$this->paginate = [

            'contain' => ['Users', 'Heights', 'Weights', 'Bats', 'Throws', 'PrimaryPositions', 'SecondaryPositions']

        ];

    $this->set ( 'players', $this->paginate ( $this->Players ) );

And my index.ctp is the standard baked template with the following sort link:

  <th><?= $this->Paginator->sort('username') ?></th>

According to the documentation, if I click the title Username, it should default to ASC, then Alternate between ASC and DESC.

Mine never alternates...

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