Google says each language version must list itself as well as all other language versions, and that if two pages do not both point to each other, the tags will be ignored.
https://developers.google.com/search/docs/specialty/international/localized-versionsThe full answer on adding hreflang tags and best practices is on the blog:
https://aiwebpageseo.com/blog/how-to-add-hreflang-tags-best-practicesWhich hreflang problems have you found when auditing sites, and how did you fix them?
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