The direct answer
A self-referencing canonical indicates the page's preferred URL is itself. It does not independently prove the page is indexable or selected as canonical by a search engine.
Start with the evidence
Compare the canonical with the final URL, indexing directives and sitemap entry. Check for alternate hostnames, unexpected parameters and redirect targets.
Make the change deliberately
Correct contradictory signals and inspect authorized search reporting where available. Keep the distinction between your declared preference and the search engine's selected URL.
Further reading
Platform guidance can change. Consult the current official documentation before making platform-specific changes.
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