WKWebView webViewDidFinishLoad only called once

Question

Some specific URL https://stg.express.rakuten.co.jp/?tn=600149999205 when I open the page in WKWebView it's calling didCommitNavigation multiple time (2 times) but it's calling didFinishNavigation delegate method only for one time.

Does anyone have an idea why it's happening?

I referred this post but in that case, webViewDidStartLoad/webViewDidFinishLoad called multiple time for a single request while in my case it's calling didCommitNavigation multiple times.

public func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {
}

open func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
}