IntelliJ IDEA compact empty middle packages not show all package

System:

IntelliJ IDEA 2018.1.5 (Ultimate Edition)
Build #IU-181.5281.24, built on June 12, 2018
JRE: 1.8.0_152-release-1136-b39 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Windows 10 10.0

Detail:

AS the pictures.When one source (b) in another source(a),when I chose " compact empty middle packages" ,package in source b isnot show