stream: `pipeTo` with `preventCancel` can hit `ERR_INTERNAL_ASSERTION` if destination errors before deferred write

Version

v24.16.0

Platform

Linux n37-114-192 5.15.120.bsk.3-amd64 #5.15.120.bsk.3 SMP Debian 5.15.120.bsk.3 Fri Dec 8 12:41:09 UTC x86_64 GNU/Linux

Subsystem

stream

What steps will reproduce the bug?

const { ReadableStream, WritableStream } = require("node:stream/web");

let sourceController;
let destController;

const source = new ReadableStream({
  start(controller) {
    sourceController = controller;
  },
});

const dest = new WritableStream({
  start(controller) {
    destController = controller;
  },
  write() {},
});

source.pipeTo(dest, { preventCancel: true }).catch((err) => {
  console.log("pipeTo rejected:", err.name, err.message);
});

setImmediate(() => {
  destController.error(new Error("destination errored"));
  sourceController.enqueue("chunk");
});

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

Always.

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

pipeTo() should reject with the destination error, like v24.14.1 does:

pipeTo rejected: Error destination errored

What do you see instead?

node:internal/assert:11
    throw new ERR_INTERNAL_ASSERTION(message);
          ^

Error [ERR_INTERNAL_ASSERTION]: This is caused by either a bug in Node.js or incorrect usage of Node.js internals.
Please open an issue with this stack trace at https://github.com/nodejs/node/issues

    at assert (node:internal/assert:11:11)
    at writableStreamDefaultWriterWrite (node:internal/webstreams/writablestream:982:3)
    at node:internal/webstreams/readablestream:1677:33
    at process.processTicksAndRejections (node:internal/process/task_queues:104:5) {
  code: 'ERR_INTERNAL_ASSERTION'
}

Node.js v24.16.0

Additional information

The error starts to occur in v24.15.0. This lines up strongly with https://github.com/nodejs/node/pull/61800.

Run the supplied reproduction on v24.16.0 and compare it with v24.14.1. Inspect node:internal/webstreams/writablestream at line 982 and node:internal/webstreams/readablestream at line 1677, then review PR #61800; done means a regression test confirms preventCancel rejects with the destination error instead of ERR_INTERNAL_ASSERTION.