TYPO3 Core

I could confirm this behavior in several different TYPO3 CMS installations.

I'm not sure if this issue is related to EXT:seo's XML sitemap or even larger to the general page rendering. I haven't enough time to investigate any further but to reproduce this behavior.

Now I had a bit of time investigating.
The Problem is, that queryParams are ignored in Caching, when no cHash is given.
But im not sure what should be the correct behavior.

vendor/typo3/cms-frontend/Classes/Controller/TypoScriptFrontendController.php Line 1130

 protected function getRelevantParametersForCachingFromPageArguments(PageArguments $pageArguments): array
    {
        $queryParams = $pageArguments->getDynamicArguments();
        if (!empty($queryParams) && ($pageArguments->getArguments()['cHash'] ?? false)) {
            $queryParams['id'] = $pageArguments->getPageId();
            return GeneralUtility::makeInstance(CacheHashCalculator::class)
                ->getRelevantParameters(HttpUtility::buildQueryString($queryParams));
        }
        return [];
    }