I just figured out that the lightning bolt that I spawn using the "Strike Lightning at x y z" procedure successfully does summon a Lightning Bolt, but said lightning bolt is invisible. It lights the ground on fire, and makes the thundering sound as well, but the Bolt itself isn't visible. Here's a GIF of a clip I recorded:
To assure myself I tested my mod on my computer and 2 of the laptops at my home as well, and the same result was obtained. Please fix this bug soon!
Thanks and regards,