bullet not visually updating

[Ukendio]

Despite the CFrame clearly changing, the bullet is not updating?

import { RunService, Workspace } from "@rbxts/services";
import { copyShallow } from "./tableUtil";

interface Options {
    overrideDistance?: number;
    stepDistance: number;
    currentPosition: Vector3;
    currentNormal: Vector3;
    currentDistance: number;
    maximumDistance: number;
    bullet: BasePart;
    filter: Instance[];
}

function step(options: Options) {
    const rayCastParameters = new RaycastParams();
    rayCastParameters.FilterDescendantsInstances = options.filter;
    rayCastParameters.FilterType = Enum.RaycastFilterType.Blacklist;

    let currentPosition = options.currentPosition;
    const currentNormal = options.currentNormal;
    const direction = currentNormal.mul(options.overrideDistance ?? options.stepDistance);
    const result = Workspace.Raycast(currentPosition, direction);

    const position = result?.Position ?? currentPosition.add(direction);

    const laser = options.bullet;
    laser.Size = new Vector3(0.4, 0.4, position.sub(currentPosition).Magnitude);
    laser.CFrame = new CFrame(currentPosition.Lerp(position, 0.5), position);
    print(options.currentPosition, laser.CFrame);

    const oldPosition = currentPosition;
    currentPosition = position;

    if (result) {
        const normal = result.Normal;
        const reflect = currentNormal.sub(currentNormal.mul(currentNormal.Dot(normal)).mul(2));
        const newOptions = copyShallow<Options>(options);
        newOptions.currentPosition = position;
        newOptions.overrideDistance = options.stepDistance - position.sub(oldPosition).Magnitude;
        newOptions.currentNormal = reflect;

        print(newOptions.currentPosition === options.currentPosition);
        step(newOptions);
        return;
    }

    const newOptions = copyShallow<Options>(options);
    newOptions.currentDistance += position.sub(oldPosition).Magnitude;

    const currentDistance = newOptions.currentDistance;
    const maximumDistance = newOptions.maximumDistance;

    if (currentDistance > maximumDistance - 75) {
        const d = (currentDistance - (maximumDistance - 75)) / 75;
        laser.Transparency = d;
    }

    if (currentDistance < maximumDistance) {
        RunService.RenderStepped.Wait();
        step(newOptions);
    }
}

export function ricochet(startPosition: Vector3, startNormal: Vector3, filter: Instance[]) {
    const laser = new Instance("Part");
    laser.CanCollide = false;
    laser.Size = new Vector3(0.2, 0.2, 0.2);
    laser.Anchored = true;
    laser.Parent = Workspace;
    laser.Name = "Laser";

    print("ricochet");

    const maximumDistance = 200;
    const currentDistance = 4;

    const stepDistance = 4;

    step({
        stepDistance: stepDistance,
        currentPosition: startPosition,
        currentNormal: startNormal,
        currentDistance: currentDistance,
        maximumDistance: maximumDistance,
        bullet: laser,
        filter: filter,
    });

    laser.Destroy();
}