Fixed an issue where changes made with the many-to-many checkbox field were not being saved properly on forms such as product pages. This helps prevent users from losing selections and improves reliability when editing records.

Task: https://www.odoo.com/web#id=11873&view_type=form&model=project.task&menu_id=3942&action=327
pad: https://pad.odoo.com/p/r.WXTNMDeo4WsZir0j