Mar 20
6
Gary Illyes from Google wrote in a Reddit thread that “generally” your hreflang annotations are not processed or picked up until all the pages in the set that you are linking to are crawled and re-indexed. He wrote “Generally the hreflang annotations are picked up once all pages that you linked together with them are crawled and (re)indexed.”
Read the original:
Google: Hreflang Annotations Not Processed Until All Pages In The Set Are Crawled & Indexed