Atribute visible from MenuItem is not work in SplitButton

[netstart]

[ x ] bug report

What is the motivation / use case for changing the behavior?
Atribute visible from MenuItem is not work in SplitButton

Please tell us about your environment:
Windows 10
IDE: Webstorm

• Angular version: 5.2.1

• PrimeNG version: 5.2.0

• Browser:
  Versão 63.0.3239.132 (Versão oficial) 64 bits

• Language:
  "typescript": "~2.6.1"
  "target": "es5",

• Node (for AoT issues):
  v9.2.1

[skormel]

I updated primeng from 5.0.2 to 5.2.0 and visible property from menuitem of all the contextmenu stop working (always it's shown). I revert to 5.0.2 and start working again.