Sliding navigation: "Back" button chevron points to right instead of left

[juanruitina]

Describe the bug

"Back" button chevron is suddenly pointing to the right instead of the left, where it should intuitively point. I think this is a regression introduced by a recent Vanilla update: it's not happening live on ubuntu.com, but it is on demos.

To Reproduce

1. Open https://vanillaframework.io/docs/examples/patterns/navigation/sliding-dark on a small viewport
2. Open menu, then go to a second level (e.g. "LXD")

Screenshots