diff --git a/includes/CommentFormatter.php b/includes/CommentFormatter.php
index 980353539..a4817ec2a 100644
--- a/includes/CommentFormatter.php
+++ b/includes/CommentFormatter.php
@@ -362,7 +362,10 @@ class CommentFormatter {
 			return $item->jsonSerialize( true );
 		}, $threadItemSet->getThreadsStructured() );
 
-		$pout->setJsConfigVar( 'wgDiscussionToolsPageThreads', $threadsJSON );
+		// Temporary hack to deal with T351461#9358034: this should be a
+		// call to `setJsConfigVar` but Parsoid is currently reprocessing
+		// content from extensions.
+		$pout->addJsConfigVars( 'wgDiscussionToolsPageThreads', $threadsJSON );
 
 		// Like DOMCompat::getInnerHTML(), but disable 'smartQuote' for compatibility with
 		// ParserOutput::EDITSECTION_REGEX matching 'mw:editsection' tags (T274709)