Issue when using a transparent stroke with vertex()

Created by: finerrecliner

Description

I'm running into a possible bug when using vertex() with a stroke that has transparency/alpha. I would expect the color to be consistent from the beginning to the end of the drawn line. Instead there are "dots" that appear at the vertices. Here is an example:

size(400, 400, P2D);
smooth(8);
background(0);
stroke(255, 60);
noFill();
strokeWeight(1.9);
beginShape();
for (int x = 100, y = 100; x < 300; x+=20, y+=20) {
  vertex(x, y);
}
endShape();

I'd like to use a strokeWeight of 1 in my project, but the issue is easier to visualize at 1.9. The issue goes away if using a strokeWeight >= 2.0, as seen here:

The issue also goes away if using the default renderer instead of P2D, but I need to use P2D for my project for additional reasons. I've tried using different strokeJoin options but it doesn't seem to change the result here.

My Environment

• Processing v4.1.2
• Windows 10
• Nvidia RTX 2060 Super

Start with the provided P2D sketch and compare its transparent stroke rendering at weights below and above 2.0, including the default renderer as a control. Done means the vertices no longer produce visible dots while preserving consistent transparency for thin strokes.