The Notes app was reorganized and modernized internally, making it easier to maintain while preserving its existing user experience. The update also fixes an issue in mail follower handling that could interfere with creating notes, improving reliability for users who collaborate around notes.

Task: https://www.odoo.com/web#id=13294&view_type=form&model=project.task&menu_id=3942&action=327
Pad: https://pad.odoo.com/p/r.ZG9OnTSXxZbnLSYM