Some variables didn't work like they were documented

Problem Description

Some of the variables do not work in Bamboo despite it's documented in Bamboo Variables. Here are some of the variables that do not work.

bamboo.shortPlanKey
bamboo.shortPlanName

It will return something similar like the following error message.

/tmp/TPRO-PG-JOB1-35-ScriptBuildTask-2385598182076022059.sh: 2: /tmp/TPRO-PG-JOB1-35-ScriptBuildTask-2385598182076022059.sh: Bad substitution

Steps to replicate

1. Create a test Plan
2. Create a script task in that plan, leave everything on default will do
3. Put the following on the script text box

   echo ${bamboo.shortPlanKey}
   echo ${bamboo.shortPlanName}
   

4. Save the task and run