wps_products_buy_button shortcode not working from functions.php

Hello,

I am trying to use the [wps_products_buy_button] shortcode from within my functions.php file to output buy buttons into AJAX-filtered posts.

Running the shortcode from functions.php outputs the wrapper for the buy button with a .wpshopify-loading-placeholder inside but never actually loads the button.

Ref: https://share.getcloudapp.com/6queY9wr

Is there a function called on pageload that isn’t happening when the shortcode is run through PHP/AJAX later? Any help you can offer would be appreciated.

Thanks