We need to replicate this issue on a fresh WordPress installation. Then, if needed, I'll be able to escalate it to our compatibility team. To achieve this, I created a test website with a clean WordPress installation. You can access it through this link:
hidden link
With this link, you'll be directly logged in.
Could you please install the Advanced Product Fields Addons plugin and see if the issue is replicable on a clean WordPress installation?
I already configured WPML to have German as the default language and English as the second language. Please configure WooCommerce as it is set on your site (just the basic configurations needed to replicate the issue are sufficient).
Please also make sure that you are installing the latest version of the plugin.