Chrome extension proxy authentication

I’ve got problem in proxy authentication using chrome extension (due to problems with v3 my code is based on manifest v2). The connection works using the following curl command:

curl -v -x https://11.111.11.111:222 https://www.google.com/ --proxy-header "proxy-authorization: Basic abc" --proxy-insecure

And I tried to implement it in extension. Here’s what I have in background.js file:

chrome.runtime.onStartup.addListener(() => {
    const config = {
            mode: 'fixed_servers',
            rules: {
                singleProxy: {
                    host: '11.111.11.111',
                    port: 222,
                    scheme: 'https',
                },
            },
        }

        chrome.proxy.settings.set({ value: config, scope: 'regular' })
})

chrome.webRequest.onBeforeSendHeaders.addListener(
    (details) => {
        const requestHeaders = details.requestHeaders || []
        requestHeaders.push({
            name: 'proxy-authorization',
            value: 'Basic abc',
        })

        return { requestHeaders }
    },
    { urls: ['<all_urls>'] },
    ['blocking', 'requestHeaders', 'extraHeaders']
)

chrome.webRequest.onSendHeaders.addListener(
    (details) => {
        console.log('sending', details)
        return details
    },
    { urls: ['<all_urls>'] },
    ['requestHeaders', 'extraHeaders']
)

I have the following permissions in manifest.json:

"permissions": [
        "cookies",
        "storage",
        "tabs",
        "activeTab",
        "proxy",
        "webRequest",
        "webRequestBlocking",
        "<all_urls>"
    ]

And these are the headers that are printed in onSendHeaders function:

You see that proxy-authorization header is present. But I get ERR_PROXY_CERTIFICATE_INVALID while trying to browse any page. Proxy headers should be set in a different way? Because I use --proxy-header flag in the curl command, not --header.

PS. I tried using the method that is mentioned many times:

chrome.webRequest.onAuthRequired.addListener(function(details, callbackFn) {
    callbackFn({
        authCredentials: { username: username, password: password }
    });
},{urls: ["<all_urls>"]},['asyncBlocking']);

too, but this function is never called (I put console.log inside).