[bluefairydevelopment]

Documentation only. After switch_to_blog(), registered post types and taxonomies still reflect the site handling the request, so WP_Query with 'post_type' => 'any' builds its post_type IN (...) list from the original site. As noted in comment 3 on the ticket, the root cause is the same as #20541 (closed invalid), so this documents the behaviour rather than changing WP_Query.

• switch_to_blog() docblock: post types, taxonomies and other registries do not switch, which affects get_post_types(), post_type_exists(), taxonomy_exists() and WP_Query with 'any' or a tax_query.

No code changes. php -l and phpcs are clean for ms-blogs.php.

Trac ticket: https://core.trac.wordpress.org/ticket/63768

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Used for: reading the ticket and the code, and drafting the documentation wording. Submitted by Blue Fairy Development, who are responsible for the change.

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[bluefairydevelopment]

Thanks @peterwilsoncc, that makes sense. I've removed the WP_Query docblock change, so the note now lives only in switch_to_blog().