Client incorrectly tries to place skull on chest

[christopherplaysminecraft]

General Information

Release 4.0.3
Version 1.8.x

Bug Description

When holding a skull and shifting at the same time, right clicking a chest tries to place the block against it, whereas it wouldn't do so with a vanilla 1.8.x client.

hypixel-powder-chest-gauntlet.mp4

Steps to Reproduce

As explained above

Expected Behavior

Not try to place the skull