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Good luck, mate. You've monitored what's on the wire much closer than I have -- I'm new to unraid, so perhaps my suggestion was beginner's luck. I hope you find the answer!

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Brave "Shields" are essentially an ad blocker with some other cookie blocking stuff built in. If you've got an adblock extension installed, maybe try disabling it for your unraid domain?

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@ds679Have you tried in incognito mode (i.e., without extensions running)?

 

Here's why I ask: I use Brave, a Chromium-based browser, and web-based terminals worked fine in 6.7.9. With 6.8, they started opening blank. I had to disable Brave's "shields" for my unraid site, and everything started displaying correctly again.