See linked bug in eclipse bugzilla.
Not yet fixed in 8.0.0.Alpha2 (neither in community). Please note that this does not affect an embedded AdHocSubprocess. Only a process which has isAdHoc = true
Fixed in community build for Luna, build# 1.1.1.201501072132
Verified on jbds-8.0.2.GA_jbdsis-8.0.0.CR1.earlyaccess