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ソフト404エラーが突然発生しました。原因と対応索が知りたいです。
2
■質問
今まで正常に動作していたが、ソフト404エラーが突然発生してインデックス登録が解除され、URL検査しても正常というケースは起こり得るのか知りたいです。

起こり得る場合、以下も可能な範囲で知りたいです。
・現状はどうなっているのか。
・どのようなケースで発生し得るのか。※再発を防止したい。
・「再度、インデックス登録をリクエストすればOK」など、どのような対応をとればいいか知りたい。

■表示されたエラー
「送信された URL はソフト 404 エラーのようです」

■対象ページ
サイトのトップページ

■環境
Reactを利用したSPAベースのサイトですが一般的なクローラー対策を実施しており、インデックスが登録された状態で運用してきました。

■現状
・sitemap.xmlの検証結果は正常でした。
・robots.txtテスターで確認してエラーは0件でした。
・該当のトップページ及びコンテンツは存在しています。
・以下のヘルプに従い、URL検査を行いましたが正常でした。
 ※「URLはGoogleに登録できます」「URLはインデックスに登録できます」「このページはモバイルフレンドリーです」と緑色の正常マークが表示されているため問題なさそうです。
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ご回答いただきありがとうございます。
その観点で確認してみようと思います。
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