HTML/CSS/JS Rendering in Job Build Summary pages

Hi all,
I am having issues rendering html/css/js on job build summary pages.
This is something we have working on v.2.73.3 but breaks on our tests in 2.378.1. I know that’s a lot of versions to jump.

We’re relying on the ‘simple theme’ plugin but I was wondering if any system level changes to Jenkins security could be blocking our use case?

I’ve tried running some CSP changes to see if I could open up the functionality we need.
Injecting HTML/CSS/JS works on all other pages, description pages, and even home page we have a state of our job runs table displaying fine. It’s just the results page after a job is run that blocks links and JS Frames. The code is injected but shows as code rather than a hyperlink or JS window.