Honestly, I'm praying and hoping for someone to hint at something stupid I might have missed and if someone does I'd be thankful.
This has been going on for quite some time and alas I have checked a lot of these things.
I had a fresh run today of looking into it via the Safari inspector connected to my Mac and I was hoping to see an older version displayed but, no. It's the current version.
Our deployment process for this forum handles minifying/rolling up JS so whether I'm in debug/development mode or not I should always have the correct version. But either way, currently browsing without fullJS and debug.
It's very stupid.