PShape.getVertexCount() always outputs 0

[dtplsongithub]

Most appropriate sub-area of Processing 4?

Core/Environment/Rendering

Processing version

4.3.1

Operating system

Windows 11 (24H2)

Steps to reproduce this

PShape.getVertexCount() always seems to output 0. (tried 1 .svg file and 4 .obj files, even included the .mtl files)

snippet

PShape shape;
  
void setup() {
  size(640, 360, P3D);
    
  shape = loadShape("cuboctahedron.obj");
  println(shape.getVertexCount()); // zero???
}

void draw() {
  background(0);
  lights();
  translate(width/2, height/2, -200);
  scale(50);
  rotateY((float)millis()/2000);
  shape(shape);
}

Additional context

No response