Ok so this bug is a little bit funny because is more a glitch than a bug(i guess)

So, when u use a dispenser to put armor and stuff on a zombie(eg. shield, sword)and after put in his hand a shield in second hand or a sword.

And to try the bug is easy u must use a dispenser with a sword and a shield in it and push them to zombie. I attached a video to show you how it work because im from romania and im not very good speaking english, so sorry my bad english and rezolution but i must use a low bitrate.