Hreflang alternate as single-hop 301 - is this actually a problem?
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First, this is not a question about whether 301 redirects pass page rank.
My question is that if your hreflang alternative page URL is a 301 redirect*, are there any downsides. In all cases with our situation, the 301 redirect is single-hop and working.
Tools, such as SEMRush seem to flag this as a non-canonical hreflang error, but I'm not able to find any cases where Google has suggested a redirecting hreflang is a problem.
I'd appreciate any information on this issue before we invest extra time on a large international site.
*In Drupal, there are scenarios where it's all but impossible to avoid having a 301 redirect in your hreflang alternate URL without significant custom work.