In some POST transmissions using NavigateWithWebResourceRequest, HTTP headers are not reflected correctly

Description

When sending NavigateWithWebResourceRequest by POST, I want to change the HTTP header and send it, but only three, origin, sec-fetch-site, and referer, are fixed.

origin: null

sec-fetch-site: none

referer is not reflected

Version
SDK: 1.0.1245.22
Runtime:
Framework: Win32(x64)
OS: Win10

Repro Steps

        QString strHeader = QString("content-type: application/x-www-form-urlencoded\r\n"
                                    "cache-control: max-age=0\r\n"
                                    "sec-ch-ua: \" Not;A Brand\";v=\"99\", \"Chromium\";v=\"103\", \"Microsoft Edge\";v=\"103\"\r\n"
                                    "sec-ch-ua-mobile: ?0\r\n"
                                    "sec-ch-ua-platform: \"Windows\"\r\n"
                                    "upgrade-insecure-requests: 1\r\n"
                                    "origin: https://www.google.co.jp\r\n"
                                    "user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.53 Safari/537.36 Edg/103.0.1264.37\r\n"
                                    "accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9\r\n"
                                    "sec-fetch-site: same-origin\r\n"
                                    "sec-fetch-mode: navigate\r\n"
                                    "sec-fetch-user: ?1\r\n"
                                    "sec-fetch-dest: document\r\n"
                                    "referer: https://www.google.co.jp\r\n"
                                    "accept-encoding: gzip, deflate, br\r\n"
                                    "accept-language: ja,en;q=0.9,en-GB;q=0.8,en-US;q=0.7\r\n"
                            );
        CHECK_FAILURE(m_webviewEnvironment2->CreateWebResourceRequest(
            url.toString().toStdWString().c_str(), L"POST", postDataStream.get(),
            strHeader.toStdWString().c_str(), &webResourceRequest));
    wil::com_ptr<ICoreWebView2_2> webView2;
    CHECK_FAILURE(currentWebView()->QueryInterface(IID_PPV_ARGS(&webView2)));
    CHECK_FAILURE(webView2->NavigateWithWebResourceRequest(webResourceRequest.get()));

Screenshots

Additional context

AB#41852204

Start by reproducing the supplied Win32 example using CreateWebResourceRequest and NavigateWithWebResourceRequest on the reported SDK and OS. Compare the requested headers with those received by the target server, focusing on origin, sec-fetch-site, and referer. Done means determining whether the behavior is an API defect or documented restriction and recording the supported behavior or a fix path.