Tried and installed both extensions. They work individually but not together.
The error is;
/mediawiki/index.php/Special:NewProperty MediaWiki\Page\PageAssertionException: The given PageIdentity Special:Badtitle/NS122:NewProperty does not represent a proper page
#0/mediawiki/extensions/Wikibase/repo/includes/EditEntity/MediawikiEditFilterHookRunner.php(142): MediaWiki\Page\WikiPageFactory->newFromTitle()
....
Any advice?