getCoreVersion returns empty string in version 3.0.0

[fabianoriccardi]

Platform

• Hardware: [esp8266ex]
• Core Version: 3.0.0
• Development Env: [Arduino IDE]
• Operating System: [Windows]

[MCVE] Sketch

void setup() {
  Serial.begin(115200);
  Serial.println("1");
  Serial.println(ESP.getCoreVersion());// Initialize the LED_BUILTIN pin as an output
  Serial.println("2");
}

void loop() {}

On serial monitor I can see "1" and "2", the line that should contain the core version is empty.

[d-a-v]

Closing as duplicate of #8114 and #8049.
Thanks for reporting, it will be fixed in v3.0.1.