"Trigger even if the build is unstable" does not trigger the dependent projects when the build was unsuccessful for free-style software project.

How to reproduce:
1) Create a New Job name TEST.NEXT, choose "Build a free-style software project"
Add build step: Execute Windows batch command
echo EXECUTING TEST.NEXT
2) Create New Job name TEST.FAIL, choose "Build a free-style software project".
Add build step: Execute Windows batch command
cmd /C exit 1
Build other projects: TEST.NEXT, check "Trigger even if the build is unstable"
3) Start TEST.FAIL job, which fails. The TEST.NEXT job is never executed

Note, that I am not sure if the Jira core component is correct.