Bug: @Prop <prop_name> on <>is immutable on <stencil_router_component>

[rwaskiewicz]

NOTE

This is a recreation of ionic-team/stencil#2853. I was unable to transfer the original issue due to the repos belonging in different repositories.

Resources:
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Stencil version: (run npm list @stencil/core from a terminal/cmd prompt and paste output below):

v2.17.0

I'm submitting a ... (check one with "x")
[x] bug report
[ ] feature request
[ ] support request => Please do not submit support requests here, use one of these channels: https://forum.ionicframework.com/ or https://stencil-worldwide.slack.com

Current behavior:

Stencil throws many warnings:-

• @prop() "history" on is immutable but was modified from within the component
• @prop() "location" on is immutable but was modified from within the component.
• @prop() "routeViewsUpdated" on is immutable but was modified from within the component.
• @prop() "historyType" on is immutable but was modified from within the component.

Expected behavior:

N/A

Steps to reproduce:

The issue is happening on stencil's starter app also.

1. Follow the steps mentioned here: https://stenciljs.com/docs/getting-started and create an app.
2. Serve the app and open it in a browser.
3. You'll the see the above listed warnings.

Related code:

insert any relevant code here

Other information: