Grouping mail activities by "Created by" was grouping on the "create_uid" field which is always the admin user. New groupby groups using the "create_user_id" field which is the real id of the creator. opw-1886369 closes odoo/odoo#27718
Grouping mail activities by "Created by" was grouping on the "create_uid" field which is always the admin user. New groupby groups using the "create_user_id" field which is the real id of the creator. opw-1886369 closes odoo/odoo#27718