[Cerrado] White page on some of Rank Math's Sitemaps

Background of the issue:
I am trying to visit some pages in the sitemap: enlace oculto, enlace oculto, enlace oculto. I expected to see working sitemaps and all translated pages: besides /en/ also pages in /nl/ and /fr/.

Symptoms:
I got only English pages or a white screen. Disabling the WPML SEO plugin seems to fix the white screens.

Questions:
Why do I see a white screen on some of Rank Math's sitemaps?
How can I ensure all translated pages appear in the sitemap?