I find next apps are notorious for not respecting URL state. I’m not sure why. I’ve always disliked that and caching in next. Edit: in this case it seems to be

I find next apps are notorious for not respecting URL state. I’m not sure why. I’ve always disliked that and caching in next. Edit: in this case it seems to be working. Where are you seeing that issue? The cart is a little weird. The number of items in it can be wrong, and it can disappear.