Elysia.handle is not streaming Stream response.

[soonoo]

With Stream plugin integrated with sveltekit server routes, Elysia.handle seems not streaming stream response.

src/routes/[...slugs]/+server.ts:

import { Elysia } from 'elysia';
import Stream from '@elysiajs/stream';

type RequestHandler = (v: { request: Request }) => Response | Promise<Response>

export const app = new Elysia()
    .get("/stream", () => new Stream(async (stream) => {
        stream.send("hi");
        await stream.wait(2000);
        stream.send("hi2");
        stream.close();
    }))

export const GET: RequestHandler = ({ request }) => app.handle(request)
export const POST: RequestHandler = ({ request }) => app.handle(request)

Logs on client side are printed simultaneously after stream is closed. Error message comes out immediately after stream close also.
src/routes/+page.svelte:

<script lang="ts">
    import { onMount } from "svelte";

    onMount(() => {
        const evtSource = new EventSource("/stream", {
            withCredentials: true,
        });
        evtSource.onmessage = (event) => {
            console.log(new Date())
            console.log(event.data);
        };
        evtSource.onerror = console.error;
    });
</script>
<div></div>

Any hint on this?