Recent commit [1] in Odoo 15 (which is a backport of commit [2] which was merged in Odoo 17) introduced a security layer on forms but only for forms which are inside `ir.ui.view`. The forms inside HTML fields are thus not working anymore, because those don't receive the required signature. For the record: - `ir.ui.view` = `website.page` pages, some part of the controller pages - HTML fields = the most part of the editable areas in controller pages [1]: https://github.com/odoo/odoo/commit/17c6f6f30bf13bd3c303b28d9a314bd76dd8f4dc [2]: https://github.com/odoo/odoo/commit/7d25e7bf9243367c87b1b2005587ae728730b49c opw-3586333 closes odoo/odoo#143139 closes odoo/odoo#143879 X-original-commit: 5e5a14ae4a522a589f6112d1687bb910f86f9a6d Signed-off-by: Jérémy Kersten <jke@odoo.com> Signed-off-by: Romain Derie (rde) <rde@odoo.com> Co-authored-by: Vranckx Florian (flvr) <flvr@odoo.com> Co-authored-by: Romain Derie <rde@odoo.com>