7-Step Post-Upgrade Checklist to Verify a WordPress Major Update

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A WP-CLI 'success' message only confirms that core files were replaced, not that the site is fully functional after a major WordPress upgrade. Developers are advised to follow a structured post-upgrade checklist covering core file integrity, admin dashboard health, plugin status, and frontend page responses. WordPress can silently deactivate plugins when it detects compatibility issues with the new core, making plugin verification a critical step. Browser console checks are equally important, as JavaScript errors — such as jQuery conflicts — can break interactive features while pages appear visually normal. Deferring verification increases the difficulty of tracing issues back to the upgrade, so checks should be performed immediately and prioritized by potential user impact.

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