[site-showcase] Blank page when visiting and navigating back

[krismorf]

Description

In Gatsby Showcase when the user clicks on 'Visit site' and navigates back, a wild blank page appears.

Steps to reproduce

1. https://www.gatsbyjs.org/showcase
2. Click any site
3. Click 'Visit site'

Expected result

When clicking back user should return to the showcase, although it would be a better if the page opened in a new window.

Environment

All browsers

[sidharthachatterjee]

Thank you for reporting this @krismorf

This is a known issue and documented at #10727

I'm closing this for now since it is a duplicate but please feel free to follow along there!