How did you come to this conclusion? "Somehow this generates an error when Googlebot tries to index the pages and the error causes the Nuxt client-side code to show the 404 page."
We're currently having the same issue after upgrading Nuxt 3.9.3 to Nuxt 3.15.4 and upgrading major versions;
"@nuxtjs/i18n": "9.1.5",
"@nuxtjs/sitemap": "^7.2.4",