If you place an Anvil like in the photo you can walk through the side where the anvils pointing towards you.
Environment
OSX , Java Version 7 Update 75
Linked issues
duplicates 1
Attachments
Comments 2
Please also see MC-1635 for the reason for this bug
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-1669. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.