internal error; reference = — in local dev fetch() to https URLs, goes away when URL is http — traces to middleware-ensure-req-body-drained

### What versions & operating system are you using?

Wrangler latest, also tried Wrangler 4.14.3, macos latest

### Please provide a link to a minimal reproduction

https://github.com/irvinebroque/broken

### Describe the Bug

This code:

```ts
export default {
async fetch(request, env, ctx): Promise {
return fetch('https://cloudflare.com');
},
} satisfies ExportedHandler;
```

(or anything that makes a subrequest) — fails with an error like this:

`internal error; reference = o52qhlf1tg3pfgpu24d1q0bh`

```
[wrangler:inf] GET / 500 Internal Server Error (65ms)
[wrangler:err] Error: internal error; reference = 43hj7e49i133rl2j5p5p8re7
at async Object.fetch (file:///Users/brendan/src/broken/src/index.ts:3:15)
at async jsonError (file:///Users/brendan/src/broken/node_modules/wrangler/templates/middleware/middleware-miniflare3-json-error.ts:22:10)
at async drainBody (file:///Users/brendan/src/broken/node_modules/wrangler/templates/middleware/middleware-ensure-req-body-drained.ts:5:10)
```

**If you change the URL to `http` rather than `https` it's fine.**

### Repro:

https://github.com/irvinebroque/broken

- fails even when WARP is not running
- I reproduced this with new machine and no special WARP certs installed
- does not fail when using Wrangler v `~3.10.0`