I'm guessing you meant to write
$content = $content->getContentHandler()->unserializeContent( $newText
);
since there's no way this could have ever worked otherwise. Filed as
https://phabricator.wikimedia.org/T222413
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Hello,
I am the developer of the LinkTitles extension which uses the PageContentSave
hook to add [[...]] links to other, existing pages whenever a page is edited
and saved. The extension used to work with MediaWiki versions up to 1.31, but
no longer works with 1.32.
Hopefully it does not