Since [this commit], when dropping several "table of content" blocks on the same page, it was impossible to save. This commit solves this problem. Steps to reproduce the resolved bug: - In edit mode, drop two TOC blocks - Click on Save => the UI is blocked [this commit]: https://github.com/odoo/odoo/commit/06b03ba5ef8375b1236f6ecb52ac468124e910ba Related to opw-3047375 Related to opw-3035502 task-2948895 X-original-commit: a6de596017cdbd0da10b4050da132d46dc82a491 Part-of: odoo/odoo#107732