Voltage-Controlled Switch Issue

I implement the circuit above.

sw 0 out in 0 mysw
v1 in 0 type=pulse 0 1.0 0 0.5m 0.5m 0 1m
v2 net1 0 type=vdc vdc=3.3
r1 net1 out 1k

.model sw mysw vt=0.5 vh=0.4 ron=1 roff=1Meg
*.model sw mysw von=0.9 voff=0.1 ron=1 roff=1Meg
.tran tstep=100n tstop=3m
.plot tran v(in) v(out)
.end

Ver. 0.18
From the document, the resistance of the switch should changes from VT+VH to VT-VH (distance 2*VH)

However, the turn-on voltage is 0.9 and turn-off voltage is the same.
The hysteresis is not available.

Provide feedback