shortPlanName contains branch name for deployments

Issue Summary

According to https://confluence.atlassian.com/bamboo/bamboo-variables-289277087.html bamboo.shortPlanName should contain the name of the plan. In the case of deployment plans this variable contains the branch name (instead of the corresponding build plan name).

Steps to Reproduce

1. Create a script task that only contains echo ${bamboo.shortPlanName} in a deployment plan.
2. Create a release from the master branch. The value of the bamboo.shortPlanName is the correct one, the name of the build plan.
3. Create a release from another branch. The value of the bamboo.shortPlanName is the name of the branch instead of the name of the build plan.

Expected Results

The variable value is the name of the plan.

Actual Results

The variable value is the name of the branch.

Workaround

There is no workaround.