Problem with using mousewheel in Swiper Core

[Hiwo-1101000-1101001]

Good day.
Mousewheel does not work when using Swiper Core / Sveltekit

attempt to use mousewheel swiper core:

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

    onMount(() => {
        new Swiper(".main_page", {
            mousewheel: true,
            direction: "vertical",
            slidesPerView: 1,
            speed: 800,
            spaceBetween: 35,
        });
    });
</script>
<div class="main_page">
    <div class="swiper-wrapper">
        <div class="swiper-slide">
            ...
        </div>
        <div class="swiper-slide">
            ...
        </div>
        <div class="swiper-slide">
            ...
        </div>
    </div>
</div>

Result: The slider works, except for mousewheel.

Tried to use swiper element, in this case, mousewheel is working properly.