Hello,
Apologies for the Inconveniences caused! We have checked this out on an iPhone 12 Pro and it appears to be working fine for us. Please check the Video attached.
Additionally, it would be great if you can please provide us with a Screencast of the issue from your iPhone 12 Pro device so that we can try to determine the issue.
Meanwhile, just to confirm the Swiper Slider is at its Latest Version and there are no major changes that have been made to the core codes that handles the animations. Sometimes these are due to how different browsers handle JS events differently, in this case the Slide Transition events. We will continue checking this and release updates accordingly. Thanks for your Patience.
Meanwhile, do let us know if we can help you with anything else or if you find any further issues with Canvas.