The generated string may include %, which will confuse both the xprintf call, and the VA_FORMAT_ADVANCE macro. Pass the generated string as an argument to a "%s" format string instead. (cherry picked from commit 7325a2b2d15af09a9389723d6153050130c0bd36) (cherry picked from commit 0d4ba1519552761baeb4b464fad8854b24497193)
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