I found the source of the error, and I’ll post my solution here if some lost soul with the same problem happens to stumble upon this question.
The culprit was a piece of JavaScript at the start of the page (some old piece of Google Tagmanager/Analytics that didn’t even work).
I found it by making a copy of the page and removing piece by piece until it was possible to save without an error.
I don’t know why this script-code became a show-stopper all of a sudden, but there you have it! I am happy and hopefully the editors of the site will be too.
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