Group permission “View Company records” not working in non-workflow BP

Issue:
In a non-workflow Business Process (BP), I added a group permission with:

• View Company records
• View User records

The intent is to allow every user to view their company’s records.

However, it is not working as expected.

Steps to reproduce:

1. Created a record as User A of Company X.
2. Proxied as a partner user (User B) belonging to the same Company X.
3. Tried to view the record created by User A.

Expected result:
User B should be able to see the record created by User A since they belong to the same company.

Actual result:
User B cannot see the record.