Creators not accumulated when setting "do not accumulate" is off

[petskratt]

Description

Editing an object (ex: report) does not accumulate users as shown in https://docs.opencti.io/latest/usage/exploring-entities/#visualizing-knowledge-associated-with-a-sector - this could be regression bug related to #7290 e.g "Do not accumulate creators for the users of this group" implementation.

Environment

1. Local Docker setup, based on https://github.com/OpenCTI-Platform/docker
2. OpenCTI 6.3.6, clean install for testing

Reproducible Steps

Steps to create the smallest reproducible scenario:

1. Fresh OpenCTI 6.3.6 install, setting "Do not accumulate creators for the users of this group" for Deafult group is off
2. Create users A and B in Default group
3. Log in as user A, create report X
4. Log in as user B, edit report X (ex description / content, add observable)

Expected Output

Both users are listed as creators.

Actual Output

User A remains the sole creator

Additional information

Asked this question in https://filigran-community.slack.com/archives/C06CETVDJ5R/p1729167123623639, no response so presuming this is bug.