xPL state_changed not set as expected

items.mht:

XPL_SENSOR, slotcar-sensors.water:1, WaterDetector_1, Sensors, input

user code:

if ($WaterDetector_1->state_changed) {
     print_log "XXXXXXXXXXXX  WaterDetector1:  
state=".$WaterDetector_1->state_now;
}


debug output:

db1 xpl check: s=slotcar-sensors.water c=sensor.basic t=* d=
xpl-trig
{
hop=1
source=slotcar-sensors.water
target=*
}
sensor.basic
{
device=1
type=input
current=1
}
Device monitoring enabled: key=device, id=1, tested value=1
db3 xpl state check m=sensor.basic : current key=sensor.basic : current  
value=1
db3 xpl state check m=sensor.basic : current key=sensor.basic : type  
value=input
db3 xpl state check m=sensor.basic : current key=sensor.basic : device  
value=1
db3 xpl state check m=sensor.basic : current key=xpl-trig : source  
value=slotcar-sensors.water
db3 xpl state check m=sensor.basic : current key=xpl-trig : target  value=*
db3 xpl state check m=sensor.basic : current key=xpl-trig : hop  value=1
db3 xpl set: n=$WaterDetector_1 to state=1

03/29/12 07:29:06 PM XXXXXXXXXXXX  WaterDetector1:  state=1
03/29/12 07:29:07 PM [Insteon::BaseObject] received command/state
acknowledge from $storage: on and data: fe
db1 xpl check: s=slotcar-sensors.water c=sensor.basic t=* d=
xpl-trig
{
hop=1
source=slotcar-sensors.water
target=*
}
sensor.basic
{
device=1
type=input
current=0
}
Device monitoring enabled: key=device, id=1, tested value=1
db3 xpl state check m=sensor.basic : current key=sensor.basic : current  
value=0
db3 xpl state check m=sensor.basic : current key=sensor.basic : type  
value=input
db3 xpl state check m=sensor.basic : current key=sensor.basic : device  
value=1
db3 xpl state check m=sensor.basic : current key=xpl-trig : source  
value=slotcar-sensors.water
db3 xpl state check m=sensor.basic : current key=xpl-trig : target  value=*
db3 xpl state check m=sensor.basic : current key=xpl-trig : hop  value=1
db3 xpl set: n=$WaterDetector_1 to state=0


What I don't see is the XXXX debug line when state is set to zero.  I
would expect to state_changed to be true as value changes from 0 to 1
and from 1 to 0.

Any ideas?

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