Some of our own extensions are based on existing special pages. According to Mediawiki programming gudelines, the code looks like this:

class WantedPagesNeo extends WantedPagesPage {

        function __construct( $name = 'WantedPages_(PR_Neo)' ) {
                parent::__construct( $name );
        }

...

Prior to 1.39, this used to work but now it crashes:

[739319141d78cf5548ef724f] /wiki/Spezial:Spezialseiten TypeError: Argument 1 passed to WantedPagesPage::__construct() must implement interface Wikimedia\Rdbms\ILoadBalancer, string given, called in /var/www/test/mediawiki/extensions/PPaddons/src/SpecialPages/WantedPagesNeo.php on line 26

Backtrace:

from /var/www/test/mediawiki/includes/specials/SpecialWantedpages.php(39)
#0 /var/www/test/mediawiki/extensions/PPaddons/src/SpecialPages/WantedPagesNeo.php(26): WantedPagesPage->__construct()
#1 /var/www/test/mediawiki/vendor/wikimedia/object-factory/src/ObjectFactory.php(247): PP\SpecialPages\WantedPagesNeo->__construct()
#2 /var/www/test/mediawiki/vendor/wikimedia/object-factory/src/ObjectFactory.php(152): Wikimedia\ObjectFactory\ObjectFactory::getObjectFromSpec()
#3 /var/www/test/mediawiki/includes/specialpage/SpecialPageFactory.php(1279): Wikimedia\ObjectFactory\ObjectFactory->createObject()
#4 /var/www/test/mediawiki/includes/specialpage/SpecialPageFactory.php(1314): MediaWiki\SpecialPage\SpecialPageFactory->getPage()
#5 /var/www/test/mediawiki/includes/specials/SpecialSpecialpages.php(53): MediaWiki\SpecialPage\SpecialPageFactory->getUsablePages()
#6 /var/www/test/mediawiki/includes/specials/SpecialSpecialpages.php(42): SpecialSpecialpages->getPageGroups()
#7 /var/www/test/mediawiki/includes/specialpage/SpecialPage.php(701): SpecialSpecialpages->execute()
#8 /var/www/test/mediawiki/includes/specialpage/SpecialPageFactory.php(1428): SpecialPage->run()
#9 /var/www/test/mediawiki/includes/MediaWiki.php(316): MediaWiki\SpecialPage\SpecialPageFactory->executePath()
#10 /var/www/test/mediawiki/includes/MediaWiki.php(904): MediaWiki->performRequest()
#11 /var/www/test/mediawiki/includes/MediaWiki.php(562): MediaWiki->main()
#12 /var/www/test/mediawiki/index.php(50): MediaWiki->run()
#13 /var/www/test/mediawiki/index.php(46): wfIndexMain()
#14 {main}

What does it mean and where can I find documentation on how to correct it?