IOS Safari back button issue

[Infuser]

I have noticed when using back button in IOS safari the event aggregator for router does not fire, there are quite a few tickets on back button but I think this is a different issue to the ones already logged.

I notice in desktop when clicking back button AureliaHistoryBrowser._checkUrl is called but in IOS safari its not

this.eventAggregator.subscribe('router:navigation:processing',this.saveOnRouteChanged.bind(this));

Maybe this link is relevant
https://stackoverflow.com/questions/46466618/why-popstate-doesnt-fire-my-function-when-back-button-is-clicked-mobile-ios-ch

aurelia-history-browser 1.3.2
aurelia-router 1.7.1