P5js: 3D Typography Problems/Bugs?

Adding Typography to my Sphere sketch caused further problems:

-Some of the glyphs appear to have a white background, whereas others appear to have a transparent background. (Potentially an issue caused by the font being rendered as images instead of vectors?)

-If the text part featured below is added, the outer spheres disappear. Comment it out and you see four spheres.

-The last very weird one: Change for (i = 0; i < 8; i++) { to for (i = 0; i < 1; i++) { and the sketch crashes.

The problematic part of the drawSphere() function:

	for (i = 0; i < 8; i++) {
		rotateY(i * QUARTER_PI);
		for (j = 0; j < letters.length; j++) {
			let rot = map(j, 0, letters.length-1, HALF_PI, -HALF_PI);
			translate(-textS / 3, 0, radius / 2);
			text(letters.charAt(j), 0, 0);

This was tested with chrome and an atom live server.
Here’s a link to the source files: