garbled PointLight shadows on mac

As discussed the the Discourse hub/forum: https://hub.jmonkeyengine.org/t/point-light-shadows-with-setradius/45402

The PointLightShadowRenderer paints the quad with a shadow on the Mac, but not on Linux. The only caster in the test scene is the quad that's receiving the shadows.

Here's the test app again:

import com.jme3.app.SimpleApplication;
import com.jme3.light.PointLight;
import com.jme3.material.Material;
import com.jme3.material.Materials;
import com.jme3.math.ColorRGBA;
import com.jme3.math.FastMath;
import com.jme3.math.Vector3f;
import com.jme3.renderer.queue.RenderQueue.ShadowMode;
import com.jme3.scene.Geometry;
import com.jme3.scene.shape.Quad;
import com.jme3.shadow.PointLightShadowRenderer;

public class MazeGame extends SimpleApplication {

    public static void main(String[] arguments) {
        MazeGame application = new MazeGame();
        application.setShowSettings(false);
        application.start();
    }

    @Override
    public void simpleInitApp() {
        cam.setLocation(new Vector3f(-35f, 5f, 30f));
        cam.lookAtDirection(Vector3f.UNIT_X, Vector3f.UNIT_Y);
        flyCam.setEnabled(false);

        viewPort.setBackgroundColor(new ColorRGBA(0f, 0f, 1f, 0f));
        rootNode.setShadowMode(ShadowMode.CastAndReceive);

        PointLight torch = new PointLight();
        rootNode.addLight(torch);
        torch.setColor(new ColorRGBA(1f, 1f, 1f, 1f));
        torch.setPosition(new Vector3f(3f, 4.65f, 33f));
        torch.setRadius(1000f);

        Material material = new Material(assetManager, Materials.LIGHTING);
        material.setBoolean("UseMaterialColors", true);
        material.setColor("Diffuse", new ColorRGBA(1f, 1f, 1f, 1f));
        material.setColor("Specular", new ColorRGBA(1f, 1f, 1f, 1f));
        material.setFloat("Shininess", 1f);

        Quad mesh = new Quad(10f, 10f);
        Geometry geometry = new Geometry("", mesh);
        rootNode.attachChild(geometry);
        geometry.move(-5f, 10f, 25f);
        geometry.rotate(FastMath.HALF_PI, 0f, 0f);
        geometry.setMaterial(material);

        PointLightShadowRenderer plsr
                = new PointLightShadowRenderer(assetManager, 256);
        plsr.setLight(torch);
        plsr.setShadowIntensity(1f);
        viewPort.addProcessor(plsr);
    }
}

Start by running the provided MazeGame reproduction with PointLightShadowRenderer on macOS and Linux, then inspect the renderer's shadow output for the quad. Compare the two platform results and identify why the shadow is garbled on macOS; done means the test scene renders consistent point-light shadows on both systems.