==== What is the problem?
Trying to access https://en.wikipedia.beta.wmflabs.org/wiki/24thfebchrome, returns error:
```
Original exception: [YoOZpGDfXY4Jyx21TbnuYAAAAEw] /wiki/24thfebchrome UnexpectedValueException: Path '//en.wikipedia.beta.wmflabs.org/api/rest_v1/media/math/check/tex' has no service.
Backtrace:
from /srv/mediawiki/php-master/includes/libs/virtualrest/VirtualRESTServiceClient.php(197)
#0 /srv/mediawiki/php-master/extensions/Math/src/MathRestbaseInterface.php(174): VirtualRESTServiceClient->runMulti(array)
#1 /srv/mediawiki/php-master/extensions/Math/src/MathMathML.php(108): MediaWiki\Extension\Math\MathRestbaseInterface::batchEvaluate(array)
#2 /srv/mediawiki/php-master/extensions/Math/src/HookHandlers/ParserHooksHandler.php(156): MediaWiki\Extension\Math\MathMathML::batchEvaluate(array)
#3 /srv/mediawiki/php-master/includes/HookContainer/HookContainer.php(160): MediaWiki\Extension\Math\HookHandlers\ParserHooksHandler->onParserAfterTidy(Parser, string)
#4 /srv/mediawiki/php-master/includes/HookContainer/HookRunner.php(2840): MediaWiki\HookContainer\HookContainer->run(string, array)
#5 /srv/mediawiki/php-master/includes/parser/Parser.php(1749): MediaWiki\HookContainer\HookRunner->onParserAfterTidy(Parser, string)
#6 /srv/mediawiki/php-master/includes/parser/Parser.php(726): Parser->internalParseHalfParsed(string, boolean, boolean)
#7 /srv/mediawiki/php-master/includes/content/WikitextContentHandler.php(295): Parser->parse(string, Title, ParserOptions, boolean, boolean, integer)
#8 /srv/mediawiki/php-master/includes/content/ContentHandler.php(1716): WikitextContentHandler->fillParserOutput(WikitextContent, MediaWiki\Content\Renderer\ContentParseParams, ParserOutput)
#9 /srv/mediawiki/php-master/includes/content/Renderer/ContentRenderer.php(47): ContentHandler->getParserOutput(WikitextContent, MediaWiki\Content\Renderer\ContentParseParams)
#10 /srv/mediawiki/php-master/includes/Revision/RenderedRevision.php(270): MediaWiki\Content\Renderer\ContentRenderer->getParserOutput(WikitextContent, Title, integer, ParserOptions, boolean)
#11 /srv/mediawiki/php-master/includes/Revision/RenderedRevision.php(237): MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached(WikitextContent, boolean)
#12 /srv/mediawiki/php-master/includes/Revision/RevisionRenderer.php(221): MediaWiki\Revision\RenderedRevision->getSlotParserOutput(string, array)
#13 /srv/mediawiki/php-master/includes/Revision/RevisionRenderer.php(158): MediaWiki\Revision\RevisionRenderer->combineSlotOutput(MediaWiki\Revision\RenderedRevision, array)
#14 [internal function]: MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}(MediaWiki\Revision\RenderedRevision, array)
#15 /srv/mediawiki/php-master/includes/Revision/RenderedRevision.php(199): call_user_func(Closure, MediaWiki\Revision\RenderedRevision, array)
#16 /srv/mediawiki/php-master/includes/poolcounter/PoolWorkArticleView.php(91): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#17 /srv/mediawiki/php-master/includes/poolcounter/PoolWorkArticleViewCurrent.php(97): PoolWorkArticleView->renderRevision()
#18 /srv/mediawiki/php-master/includes/poolcounter/PoolCounterWork.php(162): PoolWorkArticleViewCurrent->doWork()
#19 /srv/mediawiki/php-master/includes/page/ParserOutputAccess.php(299): PoolCounterWork->execute()
#20 /srv/mediawiki/php-master/includes/page/Article.php(705): MediaWiki\Page\ParserOutputAccess->getParserOutput(WikiPage, ParserOptions, MediaWiki\Revision\RevisionStoreRecord, integer)
#21 /srv/mediawiki/php-master/includes/page/Article.php(517): Article->generateContentOutput(User, ParserOptions, integer, OutputPage, array)
#22 /srv/mediawiki/php-master/includes/actions/ViewAction.php(78): Article->view()
#23 /srv/mediawiki/php-master/includes/MediaWiki.php(546): ViewAction->show()
#24 /srv/mediawiki/php-master/includes/MediaWiki.php(322): MediaWiki->performAction(Article, Title)
#25 /srv/mediawiki/php-master/includes/MediaWiki.php(912): MediaWiki->performRequest()
#26 /srv/mediawiki/php-master/includes/MediaWiki.php(566): MediaWiki->main()
#27 /srv/mediawiki/php-master/index.php(50): MediaWiki->run()
#28 /srv/mediawiki/php-master/index.php(46): wfIndexMain()
#29 /srv/mediawiki/w/index.php(3): require(string)
#30 {main}
```
I am not sure if this is a genuine bug in the Math extension or just beta being incorrectly configured.
I can access https://en.wikipedia.beta.wmflabs.org/wiki/24thfebchrome?action=edit without error.
==== Steps to reproduce problem
There are a few urls which have this problem, e.g.
* https://en.wikipedia.beta.wmflabs.org/wiki/24thfebchrome
* https://en.wikipedia.beta.wmflabs.org/wiki/25thfebchrome
==== Environment
**Wiki(s):** https://en.wikipedia.beta.wmflabs.org MediaWiki 1.39.0-alpha (00c5c3f) 12:08, 17 May 2022. Math 3.0.0 (72a537e) 07:32, 17 May 2022.