The swiper needs loop and speed.
observer is necessary when the 0 index is wrong.

<swiper
  :slides-per-view="'auto'"
  :loop="true"
  :speed="5000"
  :prevent-interaction-on-transition="true"
  :observer="true"
  :observe-parents="true"
  @swiper="onSwiper"
>
  <!-- ... -->
</swiper>

Once swiper js is initialized it can be looped.

onSwiper(swiper) {
  const loop = () => {
    swiper.slideTo(swiper.slides.length - swiper.loopedSlides * 2);
    swiper.once('transitionEnd', () => {
      swiper.slideTo(0, 0, false);
      setTimeout(loop, 0);
    });
  }
  loop();
}