BUG: ObjectsByGroup ignores objects attached in Worksession-v8.28/10Feb26

[_Sylvain]

I used to be able to attach files as Worksession and retrieve objects by groups in these attached files.
This doesn’t work anymore. Here is a snippet and steps to reproduce :

1. Open the attached rhino file and run the script : objects by group are printed
2. Open a new rhino file, attach the file and run the script : print result = “[]”

Could you please look into that ?
Thanks a lot!
Sylvain

260225_ObjectsByGroup_WorksessionBUG.3dm (114.7 KB)

import rhinoscriptsyntax as rs

id = rs.GetObject()
groups = rs.ObjectGroups(id)

for group in groups :
    objects_by_group = rs.ObjectsByGroup(group)
    print(objects_by_group)

edit1 : fixed indent
edit2 : Groups.GroupMembers() seems to be the problem.

https://developer.rhino3d.com/api/rhinocommon/rhino.docobjects.tables.grouptable/groupmembers

import rhinoscriptsyntax as rs
import scriptcontext
import Rhino

id = rs.GetObject()
groups = rs.ObjectGroups(id)
for group_name in groups :
     print group_name
     group = Rhino.RhinoDoc.ActiveDoc.Groups.FindName(group_name)
     index = group.Index
     print index
     members = Rhino.RhinoDoc.ActiveDoc.Groups.GroupMembers(group.Index)
     print members