This just happened this morning. I’m designing a paginated collection list to imitate a slider a la Louis Buignet’s guide.
I can only confirm that this happened on Tablet view.
When I open Preview mode, everything’s fine. But then, once I started clicking through the navigation buttons in the paginated collection list, the preview suddenly “rebooted” to display the Webflow Designer preloader animation. I exited back to Designer mode, saw my canvas was displaying the “Your browser is too small” alert, expanded it, and got this:
The issue has since resolved itself, though I wanted to report it anyway since it happened twice. The first incident was unforeseen, but the second occurred after a hard refresh & clearing my cache.