M5Paper: fillCenterSquare の挙動がおかしい

draw_square.ino

// ---------------------------------------------------------------
//	draw_square.ino
//
//						Jun/09/2022
// ---------------------------------------------------------------
#include <M5EPD.h>

M5EPD_Canvas canvas(&M5.EPD);

// ---------------------------------------------------------------
void setup() {
  // put your setup code here, to run once:
	M5.begin();
	M5.EPD.SetRotation(90);
	M5.TP.SetRotation(90);
	M5.EPD.Clear(true);
	canvas.createCanvas(540, 960);
	canvas.setTextSize(5);

	canvas.fillCenterSquare(100, 100, 50, WHITE);
	canvas.fillCenterSquare(200, 100, 40, WHITE);
	canvas.fillCenterSquare(300, 100, 30, WHITE);

	canvas.fillRect(200, 200, 50, 30, WHITE);
	canvas.drawRect(200, 300, 50, 30, WHITE);

	canvas.fillRoundRect(300, 200, 50, 30, 10, WHITE);
	canvas.drawRoundRect(300, 300, 50, 30, 10, WHITE);

	canvas.fillCircle(200, 400, 30, WHITE);
	canvas.drawCircle(200, 500, 30, WHITE);

	canvas.fillCircle(300, 400, 15, WHITE);
	canvas.drawCircle(300, 500, 15, WHITE);

	canvas.fillEllipse(200, 600, 30,15, WHITE);
	canvas.drawEllipse(200, 700, 30, 15, WHITE);
	
	canvas.fillTriangle(200, 800, 300,800, 250,750, WHITE);
	canvas.drawTriangle(200, 900, 300,900, 250,850, WHITE);
	
	canvas.fillTriangle(400, 800, 500,800, 450,775, WHITE);
	canvas.drawTriangle(400, 900, 500,900, 450,875, WHITE);
	
	canvas.pushCanvas(0,0,UPDATE_MODE_DU4);
}

// ---------------------------------------------------------------
void loop() {
  // put your main code here, to run repeatedly:

}

// ---------------------------------------------------------------

Arduino IDE

実行結果