The same code what send SSE work in node but not in bun

[Makkalay]

What version of Bun is running?

latest

What platform is your computer?

linux

What steps can reproduce the bug?

unjs/h3 app that send sse

import { Observable, interval, map } from 'rxjs';



  sse(): Observable<MessageEvent> {
    return interval(1000)
      .pipe(map((_) => ({ data: { hello: 'world' } })));
  }
``

### What is the expected behavior?

200 ok

### What do you see instead?

204 no content

### Additional information

_No response_