Plan branches use old (deleted) branches variable values

Steps to reproduce (within a plan that connects to a SCM with branches)

1. Configure a plan variable
2. Create a branch
3. Configure the variable with a value (and for instance... pass it as -Dvar=${bamboo.varname} in a maven task)
4. (maybe execute the plan, don't know if it is necessary)
5. Delete the branch
6. Create a new branch
7. Configure the variable to have a different value
8. Run the plan

• The value passed to the task is the old one

I think this may relate to the fact that bamboo names branches as "<plan-name> + index", and this does not take the deleted branches history into account, so my <bamboourl>/PLAN0 branch already existed and it is using the values that were configured in that old branch.