The Kindle Application may be using a fixed version of msedgewebview2.exe for distribution so copying from other directory won't work.
From another point, I haven't found any known issues of WebView2 being affected by recent Windows Update.
Anyway, I suggest contacting the Kindle support for more information as they distributed that particular version of WebView2. They may have done some customization in their code so we're not able to figure out what happened behind this error message. Thank you for your understanding.
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Best Regards,
Shijie Li