Description of the need Some tokens are missing from Backdrop and D7 core. This issue is addressed here https://www.drupal.org/project/token/issues/691078 and is considered major. Maybe all the needed tokens are already included in the Entity Tokens module which is now available in Backdrop contrib.
As an example I'll present here some tokens available in D8/D9 about forums which are missing from Backdrop core. Though, Entity Tokens provides availability of most of them if not all. We just need to check if there is anything not covered by the Entity Tokens module and if this module should be part of the core.
Please see in the attached photo what taxonomy tokens Drupal 9 now offers
Recent comments
Thanks for the suggestions ! site/admin/reports/status/php reports that the OpenSSL module is present : PHP Version 8.3.17 ... OpenSSL support enabled OpenSSL Library Version OpenSSL 3.0....
Failed to get available update data
Maybe use 01, 02, 03...
Book child page ordering by nodeid
You can easily check phpinfo() by going to the Status Report (admin/reports/status) and clicking the link against the PHP item:
Failed to get available update data