Unable to simulate mosfet switches

[dibalavs]

Hello. I create simple circuit to check reverse protection techinc.

https://www.multisim.com/content/MAfBEHDXUqVYQeBkPNvSdC/test_mosfet_switch/open/

Simulation looks strange.

1) setup 4 volts for voltage source.

2) setup -5 volts for mosfet gate - source threshold voltage

3) start simulation.

on probe PR1 I see current 47 femto ampere. It looks like mosfet is closed (it is correct)

on probe PR2 I see voltage 4 volts! why? The mosfet is closed, so I should see 0V voltage, but see 4. 

Is it bug?