Error: Unexpected iframe URL change

[rcebulko]

Error: Unexpected iframe URL change: https://www-thegamer-com.cdn.ampproject.org/v/s/www.thegamer.com/best-sims-4-expansion-packs/amp/?amp_js_v=0.1&usqp=mq331AQFKAGwASA= https://www-thegamer-com.cdn.ampproject.org/v/s/www.thegamer.com/best-sims-4-expansion-packs/amp/
    at message (https://raw.githubusercontent.com/ampproject/amphtml/2003101714470/src/log.js:714)
    at (https://raw.githubusercontent.com/ampproject/amphtml/2003101714470/src/log.js:309)
    at (https://raw.githubusercontent.com/ampproject/amphtml/2003101714470/src/log.js:323)
    at TAG (https://raw.githubusercontent.com/ampproject/amphtml/2003101714470/src/service/navigation.js:36)
    at (https://raw.githubusercontent.com/ampproject/amphtml/2003101714470/src/service/navigation.js:609)

Thrown by this function:

removeViewerQueryBeforeNavigation_(win, fromLocation, target) {
  dev().info(
    TAG,
    'Removing iframe query string before navigation:',
    fromLocation.search
  );
  const original = fromLocation.href;
  const noQuery = `${fromLocation.origin}${fromLocation.pathname}${fromLocation.hash}`;
  win.history.replaceState(null, '', noQuery);

  const restoreQuery = () => {
    const currentHref = win.location.href;
    if (currentHref == noQuery) {
      dev().info(TAG, 'Restored iframe URL with query string:', original);
      win.history.replaceState(null, '', original);
    } else {
      dev().error(TAG, 'Unexpected iframe URL change:', currentHref, noQuery);
    }
  };

  // For blank_, restore query params after the new page opens.
  if (target === '_blank') {
    win.setTimeout(restoreQuery, 0);
  } else {
    // For _top etc., wait until page is restored from page cache (bfcache).
    // https://webkit.org/blog/516/webkit-page-cache-ii-the-unload-event/
    win.addEventListener('pageshow', function onPageShow(e) {
      if (e.persisted) {
        restoreQuery();
        win.removeEventListener('pageshow', onPageShow);
      }
    });
  }
}

[rcebulko]

/cc @ampproject/wg-viewers for viewer-related code
/cc @choumx for last PR to touch the function (though after it had already started appearing)

[ampprojectbot]

A duplicate error report was linked to this issue (link)

[ampprojectbot]

A duplicate error report was linked to this issue (link)

[ampprojectbot]

A duplicate error report was linked to this issue (link)

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A duplicate error report was linked to this issue (link)

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A duplicate error report was linked to this issue (link)

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A duplicate error report was linked to this issue (link)

[ampprojectbot]

A duplicate error report was linked to this issue (link)

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A duplicate error report was linked to this issue (link)

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