Steps to reproduce:

1. Log in to back office.
2. Go to Content / Content structure.
3. Create a new content Product with product variants e.g Size.
4. Add customer price for added product (select product in content tree and switch to eCommerce tab).
5. Add customer group value for all available product variants and save the form.
6. Go to eCommerce > Price and stock management.
7. Download price list.
8. Open .csv file and verify if product variants contains correct values in column 'Customer group'.

Actual result:

See attached screenshots.

Customer groups are not imported to price list for product with product variants

Expected result:

Customer groups are properly imported.