Polymer dom-if not re-firing - polymer

Question

I have been having problems with my Polymer 2 app, I first through it was the routing but I found that after hitting this page and the Dom-if fires when navigating back to the page it is not re-firing.
EG,
If I am on url/matters/6719 it displays the details page, but if I click the back button and go to url/matters the dom-if is not being hit again and its still showing me the details page,
It also happens when using my navigation selector which is set up like the PWA starter kit.
<link rel="import" href="../bower_components/polymer/polymer-element.html">
<link rel="import" href="../bower_components/app-route/app-location.html">
<link rel="import" href="../bower_components/app-route/app-route.html">
<link rel="import" href="../bower_components/iron-pages/iron-pages.html">
<link rel="import" href="../bower_components/iron-selector/iron-selector.html">
<link rel="import" href="shared-styles.html">
<link rel="import" href="Matters/matter-list.html">
<link rel="import" href="MatParties/matparty-list.html">
<link rel="lazy-import" href="Matters/matter-detail.html">
<dom-module id="my-matters">
<template>
<style include="shared-styles">
:host {
display: block;
padding: 10px;
}
</style>
<app-route route="{{route}}" pattern="/:matter_id" data="{{routeData}}" tail="{{subroute}}">
<app-route route="{{subroute}}" pattern="/matparties/:this_page" data="{{pageData}}"></app-route>
</app-route>
<div class="card">
<template is="dom-if" if="[[_subidIsDefined(pageData.this_page)]]">
<matparty-list linkedmatpartyid="[[pageData.this_page]]"></matparty-list>
</template>
<template is="dom-if" if="[[!_subidIsDefined(pageData.this_page)]]">
<template is="dom-if" if="[[!_idIsDefined(routeData.matter_id)]]">
<matter-list></matter-list>
</template>
<template is="dom-if" if="[[_idIsDefined(routeData.matter_id)]]">
<matter-detail linkedmatterid="[[routeData.matter_id]]"></matter-detail>
</template>
</template>
</template>
<script>
class Matters extends Polymer.Element {
static get is() { return 'my-matters'; }
_subidIsDefined(subid) {
//There are probably ways to optimize this
if (subid) {
return true;
}
return false;
}
_idIsDefined(id) {
//There are probably ways to optimize this
if (id) {
return true;
}
return false;
}
}
window.customElements.define(Matters.is, Matters);
</script>
</dom-module>

Answer 1

have you checked the pattern? Normally the pattern should respect the url pattern.... in your case "url/matters/6719"
Since you have defined the pattern="/matparties/:this_page" on the router and matparties is != 'matters' in 'url/matters/6719' that could generate the error. I don't know if you have defined a base url that generate also some issues on this regards.
So the url should be matparties/6719 to match the pattern and resolve into the dom-if