Bug with Organic Groups register

When the module "Organic Groups Register" is activated and you have some groups marked as "Show on registration page" and you have some fields that need to be shown in a registration page in a field group, the field group does not show on registration page.

How to reproduce:

1. Create a field group in the user fields and add some required fields in it. These fields, as well as the field group, will show in the registration page
2. Activate Organic Groups register, create a group content type and add the "Group register" field to it
3. Create an organic group and set it to "Show on registration page"

Result:
the field group with the required fields disappears from the registration page, making it impossible to register...