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the goal is to generate unique and ordered millis part of timestamps in one epoch second.

unsigned long thisNowMillis;
uint32_t thisNow;

 uint32_t now = rtc_now_time.unixtime();
 if (now != thisNow) {
   thisNow = now;
   thisNowMillis = millis();
 }
 Serial.print("millis: "); Serial.print(millis() - thisNowMillis);

(not tested)