Why do Google Ads tags disappear at checkout?

Hi all. Hoping someone can help. I added a Google Ads Global Site Tag and Event Snippet in the “Checkout” section under “Order Processing”> “Additional Scripts” per the Shopify tutorial here. The tags are showing up on my homepage and product pages, but once I go to checkout, the tags fall off. Shopify support was unable to tell me anything. Really hoping someone here can help!