Some extensions of MediaWiki does not work - mediawiki

Question

I have installed MediaWiki CMS from Debian.
Before update OS from Squeeze to Jessie, all extensions worked fine.
After the upgrade, some of the extensions stopped working: Gadgets, WikiEditor. The "Gadgets" extension is in the list of extensions used on the version page. The Gadgets configuration page is in the list of seperate pages, as well as in the user settings in full. But on the pages with wiki articles, gadgets do not appear (for example Gadget-UTCLiveClock). I do not see the call to this script in the source code of the page.
enter image description here
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<script>(window.RLQ=window.RLQ||[]).push(function(){mw.loader.load(["mediawiki.action.view.postEdit","site","mediawiki.user","mediawiki.hidpi","mediawiki.page.ready","mediawiki.searchSuggest","mediawiki.page.watch.ajax","ext.gadget.referenceTooltips","ext.gadget.directLinkToCommons","ext.gadget.preview","ext.gadget.popups","ext.gadget.addThisArticles","ext.gadget.HotCat","ext.gadget.Wikilinker","ext.gadget.DotsSyntaxHighlighter","ext.gadget.UTCLiveClock"]);});</script><script>(window.RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgBackendResponseTime":385});});</script>
In mirror version (Debian Squeee, MediaWiki 1.25) all work.
enter image description here
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<script>if(window.mw){mw.config.set({"wgBackendResponseTime":320});}</script>
I installed MediaWiki 1.28 from the official site from the tar archive to a new directory and a new schema, without additional extensions. I set up Gadget-UTCLiveClock, but it still does not work on the article page.
There are no errors in the logs.
What could be the problem?
MediaWiki 1.28.0
PHP 5.6.30-0+deb8u1 (apache2handler)
MySQL 5.5.54-0+deb8u1
Debian Jessie 3.16.0-4-amd64 #1 SMP Debian 3.16.39-1+deb8u2 (2017-03-07) x86_64 GNU/Linux