I hope you are well today and thanks for posting here.
I have tested it on my test site and it’s working fine for me using the latest version of the Gillion theme and WooCommerce version 5.3.0 as displayed in the attached screenshot.
Could you please make sure that you are using the below latest version of the theme?
Hi! I did the same, and seems to be working fine as a plugin.
I have a huge issue with SCA 3D secure through woocommerce and Stripe. It seems that Gillion theme is not a part of the problem (still not 100% sure though)