6.6.0 breaks existing swipers using breakpoints

[sebastianbaumann]

• Swiper Version: 6.6.0
• Platform/Target and Browser Versions: macOS: Chrome / Safari / FireFox (latest)

What You Did

• Updated to 6.6.0

• add breakpoints to config

breakpoints: {
    // when window width is >= 320px
    320: {
      slidesPerView: 2,
      spaceBetween: 20
    },
    // when window width is >= 480px
    480: {
      slidesPerView: 3,
      spaceBetween: 30
    },
  }

Expected Behavior

Swiper should show slides as configured and be slideable

Actual Behavior

Swiper it not swiping anymore

Even breaks your demo: https://swiperjs.com/demos/380-responsive-breakpoints/core.html