An hreflang cluster must include the page it sits on. Without the self-reference the cluster is invalid, and engines are entitled to ignore the whole set.
The finding reads:
critical hreflang-no-self the cluster has no link to this page itself — without a self-reference Google treats the whole cluster as invalidAdd a link to the page itself into the cluster: without a self-reference the whole cluster is invalid.
Collapsed when it fires template-wide. If it appears on 90% or more of the pages — or of one language version — of a site with at least 20 pages, it is a property of the template and is reported once, with the count, instead of once per page.
pipx install indexgap
cd your-project
indexgap init
indexgap checkThen indexgap brief turns
every finding on this page into a work order in indexgap-briefs/,
with the thresholds the result has to satisfy and the command to check it.