Now I think I found something interesting:
/wp-admin/edit.php?post_status=private&post_type=post works
/wp-admin/edit.php?post_status=draft&post_type=post works
but
/wp-admin/edit.php?post_status=&post_type=post does not. Server error.
/wp-admin/edit.php?post_status=publish&post_type=post does not. Server error.