Jan 27 2020 05:17 PM - edited Feb 05 2020 06:50 PM
I have noticed this issue in Targeted production now. But I am worried that this will cause major usability issues if the change is pushed to Production.
I believe this issue is related to a new change for cached pages which improves page load in a SharePoint site.
Problem
The problem appears when you have multiple Single Page app pages with a SPFX webpart and use the left hand navigation menu to switch between the pages. I've noticed that the page doesn't refresh properly. The previous content remains when you switch to a different Single Page App page.
However, it reloaded the entire page when you double click the link in the left navigation. This is not normal UI experience for a web interface and people will think this is not working.
Result: the page shows the old content. It doesn't refresh the content.
When you click on a navigation item for an another single page app with a SPFX webpart, The page should be refreshed for the selected page.
I've initially raised it in SPFX issues list but it's closed because it is not considered as SPFX related issue.
https://github.com/SharePoint/sp-dev-docs/issues/5211