Thanks for the report. I can confirm it's broken, e.g. https://en.m.wikipedia.org/w/index.php?search=leipzig&fulltext=search

mw.loader.getState( "ext.echo.ui" ) shows "ready", I haven't investigated beyond that.

The problem seems to come from this code in ext.cirrus.serp.js, originally added in T190010: JavaScript redirect shows irrelevant internal information in search page:

$( document ).on( 'click', 'a', function () {
		try {
			var clickUri = new mw.Uri( location.href );
			clickUri.query.searchToken = mw.config.get( 'wgCirrusSearchRequestSetToken' );
			history.replaceState( {}, '', clickUri.toString() );
		} catch ( e ) {
		}
	} );

Looks like a conflict between replaceState() in Cirrus and router.navigate (which is deprecated, we should use navigateTo) in Echo.

@Jdlrobson @ovasileva -- we believe this is caused by the Vue rewrite of the search widget or by Minerva v2, so we think your team would handle it best. Does that sound good?

@MMiller_WMF we haven't made any changes to the mobile version of search or Minerva so this is likely an issue that has existed for some time. I think the maintainers of the CirrusSearch extension would be the best people to tackle this one.

The Search Platform team does not have any frontend expertise anymore. Even if the code is in CirrusSearch, we'll need help to figure out what's going on and fix it. @kostajh / @Jdlrobson any chance you could help us with this?

Change 670295 had a related patch set uploaded (by Jdlrobson; owner: Jdlrobson):
[mediawiki/extensions/CirrusSearch@master] CirrusSearch uses mediawiki.router

https://gerrit.wikimedia.org/r/670295

In T275901#6896599, @Gehel wrote:

The Search Platform team does not have any frontend expertise anymore. Even if the code is in CirrusSearch, we'll need help to figure out what's going on and fix it. @kostajh / @Jdlrobson any chance you could help us with this?

The above patch will fix it but it will need a review. This code should not likely be running all links - only content inside the search results $content .

Change 670295 merged by jenkins-bot:
[mediawiki/extensions/CirrusSearch@master] CirrusSearch uses mediawiki.router

https://gerrit.wikimedia.org/r/670295

Who is QAing and resolving this ticket?