impossible to use spec test reporter without new

Version

v18.18.1 and v20.8.0

Platform

all

Subsystem

node:test

What steps will reproduce the bug?

const { spec } = require('node:test/reporters');
const { run } = require('node:test');
const path = require('node:path');

run({ files: [path.resolve('./tests/test.js')] })
  .compose(spec)
  .pipe(process.stdout);

Nothing gets printed.

Instead, the following works:

const { spec } = require('node:test/reporters');
const { run } = require('node:test');
const path = require('node:path');

run({ files: [path.resolve('./tests/test.js')] })
  .compose(new spec)
  .pipe(process.stdout);

How often does it reproduce? Is there a required condition?

all the time.

What is the expected behavior? Why is that the expected behavior?

No response

What do you see instead?

No output without new

Additional information

No response