Solved the Issue, apperently it wasn't a programming related issue but a voltage issue I had in my system.
This code worked using the Pico2W and the LiquidCrystalI2C lib.

#include <Arduino.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup()
{
  lcd.init();                      // initialize the lcd 
  lcd.backlight();
  Serial.begin(9600);
}

void loop()
{
  Serial.println("Testing LCD");
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Testing LCD");
  delay(2000);
  lcd.clear();
  lcd.setCursor(0, 1);
  lcd.print("Abrakadabra");
  delay(2000);
}