MenuLinkConfigForm no longer have $accessManager, $pathAliasManager

I've just recently updated my site (to 8.8.x), and went back to change a menu link. The menu link page now gives me errors on submit. MenuLinkConfigForm's $this->accessManager and $this->pathAliasManager are not defined.

Apparently, MenuLinkConfigForm makes reference to both to $this->accessManager and $this->pathAliasManager and attempts to set them during construction, but the class doesn't have access to these variables.

If I add the following two lines to MenuLinkConfigForm, setting Menu Links works as expected:

  protected $accessManager;
  protected $pathAliasManager;

Were these previously inherited from another class? I'm wondering if something has been recently deprecated and removed from Drupal Core.