Trigger name field truncates {ITEM.LASTVALUE} to 20 characters

When using the {ITEM.LASTVALUE} in the name field of a trigger, the output of ITEM.LASTVALUE is truncated to 20 characters.

Where can I configure this? Or can this be fixed or increased to a saner value?

Here is an example of the trigger name field I'm using:
Application Log Warning: {ITEM.LASTVALUE}

This yields a result of:
Application Log Warning: The Workstation serv ...

This is truncated regardless of the width of the column. In the Monitoring > Events screen, this custom trigger's values are truncated, while other events are not truncated.