It was a browser extension. Took a bit to find it as I'm an idiot. :P
Grammarly's browser extension was the culprit. Sorry to have sent you on a wild goose-chase! haha
About to say, I was having the same thing - The Base 64 decodes to the "Akkurat" font. Didn't have the error incognito though. Crazy!
Figured it out by switching to incognito mode actually. Newly added extensions aren't enabled in incognito by default and I never enabled it there so it makes sense that it would not interfere. :)
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