Javascript animation not working from hook but works when ran in the console

I am experimenting with the Greensock animation library. I have a simple animation staged using the details in the below codepen (HTML block, CSS in the styles.css, JS added to a GP hook).

https://codepen.io/GreenSock/pen/JjYPQpN?editors=0110

I am sourcing the gsap library via the below php code invoked in my functions.php on a gp child theme. I see the library in the page sources so I believe this is working as expected.

<?php
// https://greensock.com/forums/topic/19908-wordpress-5-integration/
// The proper way to enqueue GSAP script
// wp_enqueue_script( $handle, $src, $deps, $ver, $in_footer );
function theme_gsap_script() {
    wp_enqueue_script( 'gsap-js', 'https://cdnjs.cloudflare.com/ajax/libs/gsap/3.10.4/gsap.min.js', array(), false, true );
    wp_enqueue_script( 'gsap-js-scroll-trigger', 'https://cdnjs.cloudflare.com/ajax/libs/gsap/3.10.4/ScrollTrigger.min.js', array(), false, true );
    wp_enqueue_script( 'gsap-js-custom', get_stylesheet_directory_uri() . '/js/custom-gsap-scripts.js', array(), false, true );
}
add_action( 'wp_enqueue_scripts', 'theme_gsap_script' );
?>

I've pasted the code from the hook below. When I load the page I see the hook in the footer on page inspect, but the animation doesn't trigger. When I take the same code and execute it in the console, the animation work.

<script type="text/javascript">
gsap.to(".pContent", {
  yPercent: -100,
  ease: "none",
  scrollTrigger: {
    trigger: ".pSection",
    // start: "top bottom", // the default values
    // end: "bottom top",
    scrub: true,
    markers: true
  }, 
});

gsap.to(".pImage", {
  yPercent: 50,
  ease: "none",
  scrollTrigger: {
    trigger: ".pSection",
    // start: "top bottom", // the default values
    // end: "bottom top",
    scrub: true,
    markers: true
  }, 
});
</script>

I also tried bumping down the php priority on my hook in case that let the library load first, but that had no effect and I am not exactly sure of all the mechanics there.

Appreciate any advice!