From Newsgroup: comp.lang.postscript

Thank you. My code https://raw.githubusercontent.com/jdaw1/placemat/main/PostScript/placemat.ps had a {lineto} stopped {moveto}, from which I had omitted the $error reset. Fixed.

Yes, almost thirty-one years later, this replied was used. Thank you.
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From Newsgroup: comp.lang.postscript

Cross-link: Rich Berlin was responding to https://groups.google.com/g/comp.lang.postscript/c/KPnF5bKwz5U/m/MLGrZFPfaGoJ --- Synchronet 3.21d-Linux NewsLink 1.2