http/2 option toggle breaks request

[ghost]

Describe the bug

• Node.js version: 12.13.1
• OS & version: Windows 10

Actual behavior

Running a request to a URL with the http2 option set to true. Stop the program and run the same code, but with the option now set to false and the request no longer works.

RequestError: connect ECONNREFUSED
...

Expected behavior

Toggling http2 to false should make it fallback to http and not have any errors.
...

Code to reproduce

const got = require('got');
const url = `https://discord.com/`;

got(url, {
    resolveBodyOnly: false,
    retry: {
        limit: 0
    },
    http2: true
}).then((res) => {
    console.log(res);
}).catch((err) => {
    console.log(err);
});
...

Checklist

• [ ✓ ] I have read the documentation.
• [ ✓ ] I have tried my code with the latest version of Node.js and Got.

[Giotino]

Setting http2 explicitly to false or not setting it at all is the same.
I tried your example, I'm having no problem with http2: false, I think this might be a problem on your side.

I tried with Node.JS 12.13.1, 12.18.1 and 14.1.0.

[szmarczak]

I cannot reproduce on got@11.4.0.