Using the Extended Choice Plugin with a property file, it appears to be stripping out the first value

Project config

• Basic Parameter Types:
  • Parameter Type: Single Select
• Choose Source for Value:
  • Property File = /tmp/branches-testing
  • Property Key = branches
• Choose Source for Default Value:
  • Default Value = master
• Choose Source for Value Description:
  • Description = Branch to build

test1$ echo -n "branches=master,branchA,branchB," > /tmp/branches-testing

test2$ echo -n "branches=branchC,master,branchA,branchB," > /tmp/branches-testing