B4 Back wheel landing crashes

[MUD]

I'm liking the new update and all...

but,

when going off a jump with a little bit of speed and landing on the back wheel while 'on the pipe' (Under power) the rider falls off the back

Here's 3 seperate occasions when this happens:

https://www.youtube.com/v/q-6CYXC6_8A

I'm on the 450 here.