“Group Creation Failed” when creating a group that initially includes another group as a member, no stack trace

Summary:
On internal (running a recent develop build), creating a new group with another group selected as a member during creation fails with a UI error banner: “Group Creation Failed.” Creating the group first and then adding the subgroup(s) afterward succeeds (workaround).

Environment

Server: dataverse-internal

Version/branch: develop (2025-09-15)

Browser: Chrome (latest)

Logs: No relevant stack traces observed in server.log during failure

Steps to Reproduce

Go to Admin > Permissions > Groups (any dataverse scope).
Click Create Group.
Create Group A; add 1–2 user members; save (succeeds).
Click Create Group again.
Create Group B and, before saving, add Group A as a member (along with optional user members).
Click Save.

Actual Result
UI shows a banner: “Group Creation Failed.”
The group is not created.
Server log shows no obvious error lines at the time of the attempt.

Expected Result
Group B is created successfully with Group A listed as a member (and any users), and appears under Manage Permissions > Groups.

Workaround
Create the new group without any members first, save, then edit the group and add users and groups afterward. This path succeeds.

Reproducible on dataverse-internal (develop).

Previous issue was closed since there were other priorities: https://github.com/IQSS/dataverse/issues/5197

https://github.com/user-attachments/assets/47a6f79b-ac05-4663-802c-a9e3d694773b

Start with the Admin > Permissions > Groups create-group flow in the frontend and reproduce the failure using an existing group as a member. Trace the request and error handling for initial group creation, then verify that a group with a subgroup member is created successfully and appears under Manage Permissions > Groups.