'Multiplayer Showdown' is Insanely Broken

I just downloaded the Multiplayer Showdown Sample and it is extremely broken. Aiming with RMB causes the character to shrink down to nothing, VR (which I had read was functional) doesn’t work at all, animations are all wrong, I can’t aim with the mouse, and I die (presumably, based on the animation) immediately after firing. Is this a known issue? Why is this still distributed in the Epic launcher?