Selling_plan_group is not exposed for all countries

Short description of issue

selling_plan_group is not exposed for all countries

Reproduction steps

For customers in the United States, selling plan groups are visible.
But for customers in other countries, they are not. Why?

Additional info

Hello,
On the admin product page, the purchase option is visible.
When I visit the store from the US, I can access selling_plan_groups from the product Liquid object.
However, when I visit the store from other countries, I cannot — selling_plan_groups returns an empty array.
Why is that?

What type of topic is this

Bug report