Hello there.
Since the last update of Cornerstone the “navigation off canvas” does not work in safari. It works in any other browser just fine. In safari you can hit the toggle, but nothing happens. Hitting the toggle (now an X is visible) again, the off canvas part appears for a sec while sliding out of the canvas…
again - it works in chrome in os x and in the usual windows browsers (chrome, edge). It shows the same faulty behaviour in the pale moon browser on windows though.
EDIT: It seems to affect safari version before update to iOS 26. After Update to 26 it works in Safari as well.