The bug seems to be in SitemapWarmer.php
private function parseSitemaps() {
...
$configuration = $this->getConfiguration();
// $sitemaps will contain the value '/sitemap.xml' as expected.
$sitemaps = empty($configuration['sitemaps']) ? [] : $configuration['sitemaps'];
// $sitemap_urls will contain a URL with language prefix which is incorrect.
$sitemap_urls = array_map([$this, 'resolveUri'], $sitemaps);
It's very late at the moment so I did not have time to check what the resolveUri callback is but that is anyway resulting in incorrect result in the scenario described above.
Figure out a less fragile way to resolve he full URIs of the sitemap files.
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