In documentation we state that

and

macros:

The resolved value is truncated to 20 characters to be usable, for example, in trigger URLs. To resolve to a full value, you may use macro functions.

https://www.zabbix.com/documentation/6.0/en/manual/appendix/macros/supported_by_location

While in reality if used in scripts (manual event action) they are resolved to full value. This should be stated clearly in the documentation.