When trying to edit a PShape childs vertex using the setVertex(index, int, int) method , this ArrayIndexOutOfBoundsException: 2 occurs at line 1667 of the file PShapeOpenGL.java : "if (is3D) vertices[index][Z] = z;"

It will not throw this problem if you use a different renderer because it's not 3D.

To replicate, load an svg file that has one or more children. Set renderer to P3d. Load the svg, get a child, try to edit the vertex using setVertex(index, int, int), and the error will occur.