Polylang compatibility issue

  • lisaxplore

    (@lisaxplore)


    3 days, 21 hours ago

    We found a compatibility issue between “Headers Security Advanced & HSTS WP” and Polylang Pro.

    Environment:

    • WordPress + Polylang Pro
    • “Hide URL language information for default language” enabled
    • Pretty permalinks enabled

    Issue:
    After certain plugin updates, static pages start resolving to empty archive pages until:
    Polylang → Settings → URL modifications → Save

    We traced the issue to the headers plugin triggering rewrite rule flushes during plugin update operations.

    Relevant stack trace:

    headers-security-advanced-hsts-wp.php -> flush_rules()
WP_Rewrite->flush_rules()

    This appears to rebuild Polylang rewrite rules incorrectly or in the wrong order.

    Symptoms:

    • static multilingual pages resolve incorrectly
    • archive routing takes precedence over pages
    • manually saving Polylang URL settings immediately fixes the issue

    Removing the headers plugin stops the issue.

    Could you review whether rewrite flushing during update/htaccess operations is necessary, or whether it can be delayed/avoided for Polylang compatibility?

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