Tagged Explicit Tracks Don't Appear as "Explicit" on iPhone, iPad, etc.

What steps will reproduce the problem?
1. Tag a track as "explicit" in subler
2. Import to iTunes. (Track is shown as "explicit" in iTunes)
3. When track is synced to i-device, it doesn't show up as "explicit"

What is the expected output? What do you see instead?

Explicit tagged songs on iPhone. Songs aren't tagged as anything. 

What version of the product are you using? On what operating system?

iTunes 11.2.2 on Mac OS 10.9.3

Please provide any additional information below.

Original issue reported on code.google.com by bzahler98 on 27 Jun 2014 at 5:40

XeresRazor / subler

Tagged Explicit Tracks Don't Appear as "Explicit" on iPhone, iPad, etc. #762