From that (actually quite old) article I somehow got the impression, some SUNRISE setting in my wp-config.php could be in my way. I do not have any sunrise.php, and I just uncommented the resp. setting, and everything was fine.
I guess I had once needed that setting, but bad enough I had not left a comment as an explanation.
Maybe WordPress (more or less) silently performed some upgrade itself, and sort of caused the problem “itself”, but I don’t know. Just mentioning this possibility here for completeness.
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