ptpclock: Critical warning with ptp-print-times example

(ptp-print-times.exe:46952): GStreamer-CRITICAL **: 23:45:01.399: gst_clock_set_calibration: assertion 'GST_CLOCK_TIME_IS_VALID (external)' failed

corrected_ptp_time seems to be clock-time-none at this line https://gitlab.freedesktop.org/gstreamer/gstreamer/-/blob/main/subprojects/gstreamer/libs/gst/net/gstptpclock.c?ref_type=heads#L1245

Log with GST_DEBUG=*ptp*:7 gst.log