Found another one when subscribing to https://nullsignal.games/:
discovered feedURL the error parse xml: xmlquery parse (XML syntax error on line 40: invalid character entity ») ran into problem parsing, skipping rest of document the ret struct {false parse xml: xmlquery parse (XML syntax error on line 40: invalid character entity ») ran into problem parsing, skipping rest of document {<a href="https://nullsignal.games/ ">https://nullsignal.games/ </a> false [] }}
EDIT: The invalid character displays as an HTML escape sequence: `& raquo;` (without the space). This forum turns it into the actual character.