Bundles do not work if your "use" control is not right click.

I was playing the snapshot and testing it out, and I have my "use" key as Z and not right click, and I had to change my "Use" key to right click as when I tried to drag my stuff into the bundle and started pressing Z, it didn't work. I then thought of changing it right click, it worked. I hope this is a bug, It is very likely because I tried right click aswell when my "Use" key was Z but it still didn't work.