PShape setFill(indx, color) not working in Processing 4

Most appropriate sub-area of Processing 4?

OpenGL

Processing version

4.3

Operating system

MacOSX

Steps to reproduce this

"1. The source code below demonstrates the problem. The PShape should change color when the mouse is clicked.

2. The source code runs correctly in versions 2.2.1 (macos) and 3.5.4 (reported by another forum member running Windows) indicating a runtime code change prior to version 4.

3. There is a similar report from a year ago: https://github.com/processing/processing4/issues/677"

4. We would like to change the vertex colors of the original PShape object without having to create a second object.

snippet

PShape t;

void setup() {
  size(400, 400, P2D);
  surface.setTitle("Should change color when mouse clicked.");
  t = createShape();
  t.beginShape();
  t.vertex(200, 100);
  t.vertex(100, 300);
  t.vertex(300, 300);
  t.endShape(CLOSE);
  for (int i = 0; i < t.getVertexCount(); i++) {
    t.setFill(i, color(random(255), random(255), random(255)));
  }
}

void draw() {
  background(209);
  shape(t);
}

void mousePressed() {
  for (int i = 0; i < t.getVertexCount(); i++) {
    t.getVertex(i);
    t.setFill(i, color(random(255), random(255), random(255)));
  }
}

Additional context

No response

まず、提供されたスケッチを使って動作を再現しながら、Processing 4 の OpenGL パスにおける PShape.setFill(int, color) の処理を追跡してください。可能であれば現在の動作を Processing 2.2.1 および 3.5.4 と比較し、マウスをクリックすると 2 つ目のオブジェクトを作成せずに元の PShape の頂点カラーが変わることを確認してください。