I just upgraded MediaWiki from 1.37.1 to 1.42.3 and reinstalled the TitleKey extension, version 1.0 (3acd981). I added $wgSearchType = MediaWiki\Extension\TitleKey\SearchEngine::class;
after wfLoadExtension( 'TitleKey' );
in LocalSettings.php as instructed in Extension:TitleKey#Installation. I ran the update script as part of the MediaWiki upgrade.
Unfortunately TitleKey seems to break page text search now. Case-insensitive page title search works correctly, but if I try to search for a word in the contents of a page, I get no results. I have run both RebuildTitleKeys and rebuildtextindex, but neither of them fixed the problem. If I comment out the two TitleKey lines in LocalSettings.php, then page text search works again. (Of course, page title search becomes case-sensitive.)
Is there something else I can try to get TitleKey working with page text search?