OH3: and Zigbee power plugs -- bogus values from plug

[Max_G]

openHABian 3.3.0 on rPi4 with 4GB

I wanted to monitor some pumps, and got some Zigbee power plugs.
At first these appeared to work fine. However, after adding some items to it:

… when the plug was last online, or last switched to ON, or the device connected to it started, I noticed that the plugs would report zero current on a regular interval, despite the connected device being on and using constant current.

2023-03-18 17:15:39.230 [INFO ] [b.core.model.script.SmartPlugs.05.02] - device is..: OFF
2023-03-18 17:20:06.252 [INFO ] [b.core.model.script.SmartPlugs.05.03] - device is..: ON
2023-03-18 17:20:09.260 [INFO ] [b.core.model.script.SmartPlugs.05.02] - device is..: OFF
2023-03-18 17:24:33.278 [INFO ] [b.core.model.script.SmartPlugs.05.03] - device is..: ON
2023-03-18 17:24:36.272 [INFO ] [b.core.model.script.SmartPlugs.05.02] - device is..: OFF
2023-03-18 17:29:03.300 [INFO ] [b.core.model.script.SmartPlugs.05.03] - device is..: ON
2023-03-18 17:29:06.293 [INFO ] [b.core.model.script.SmartPlugs.05.02] - device is..: OFF
2023-03-18 17:33:31.315 [INFO ] [b.core.model.script.SmartPlugs.05.03] - device is..: ON
2023-03-18 17:33:34.321 [INFO ] [b.core.model.script.SmartPlugs.05.02] - device is..: OFF
2023-03-18 17:37:58.338 [INFO ] [b.core.model.script.SmartPlugs.05.03] - device is..: ON

This interval can be 4min 27s, sometimes 5 min 54 sec.

In this case a fan which is a motor, constantly running.

I use current > 0 to see if a device is on…

rule "SP03: connected device state"
    when
        Item SmartPlug003_Current received update
    then
        if (SmartPlug003_Current.state > 0)
        {
            if (SmartPlug003_ConnectedDeviceState.state == OFF)
            {
                logInfo(LOG_PREFIX + "15.01", "SP 03 device is..: {}", SmartPlug001_ConnectedDeviceState.state)
                SmartPlug003_ConnectedDeviceState.postUpdate(ON)
                SmartPlug003_DeviceLastON.postUpdate(new DateTimeType())
            }
        }
        else
        {
            if (SmartPlug003_ConnectedDeviceState.state == ON)
            {
                logInfo(LOG_PREFIX + "15.02", "SP 03 device is..: {}", SmartPlug001_ConnectedDeviceState.state)
                SmartPlug003_ConnectedDeviceState.postUpdate(OFF)
                SmartPlug003_DeviceLastOFF.postUpdate(new DateTimeType())
            }
        }
end

I have three of these plus; all behaving the same. (Crap plug?! These are from Aliexpress; 15AUD ~10 Euro.)

My query is:

1. have other people experienced the same thing?
2. have they found plugs that do not show this behaviour? If so, please let me know, so that I can get some.