@thomasfuchs I'd put that one in one class with "CUPS not printing Cairo-generated PDFs on tuesdays" and that old 500-mile bug. :D
I can't find the source again that attributed it to the Cairo lib writing the date in an unusual, but valid position into the postscript that is to be sent to the print queue (sorry, got the PDF part wrong). Which triggered the file utility to report a wrong filetype, because it found the magic bytes "Tue" on a certain position in the file, which in turn triggered CUPS to reject the file from the print queue.
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