metadata · metadata.canonical.invalid
Canonical URL is invalid
A malformed canonical URL can make Google discard the canonical hint entirely, leaving duplicate resolution to guesswork.
Why it matters
Google may ignore the entire canonical hint when the URL is invalid.
Example fix
<link rel="canonical" href="https://example.com/page" />
Authoritative reference
https://developers.google.com/search/docs/crawling-indexing/consolidate-duplicate-urls
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