Issue with online/offline status of z-wave thing

Hello,

i always have problems with the online/offline status of z-wave things. Sometimes things are displayed online even though they are offline. Are there any tips? This device is a Steinel is 140-2 PIR
which is permanently powered (no battery device) which has not been powered for over 12 hours.

OH 2.5.4

openhab> smarthome:things show zwave:device:ba89caaa:node16
UID: zwave:device:ba89caaa:node16
Type: zwave:steinel_is1402_00_000
Label: Z-Wave Node 016: IS140-2 PIR sensor with relay
Status: ONLINE
Bridge: zwave:serial_zstick:ba89caaa

Properties:
        zwave_class_basic : BASIC_TYPE_ROUTING_SLAVE
        zwave_class_generic : GENERIC_TYPE_SENSOR_NOTIFICATION
        zwave_frequent : false
        zwave_neighbours : 1
        modelId : IS140-2
        zwave_version : 1.0
        zwave_listening : true
        zwave_plus_devicetype : NODE_TYPE_ZWAVEPLUS_NODE
        manufacturerId : 0271
        manufacturerRef : 0002:1A72,0002:6770
        dbReference : 630
        zwave_deviceid : 6770
        zwave_nodeid : 16
        zwave_lastheal : 2020-04-27T00:07:43Z
        vendor : Steinel
        defaultAssociations : 0,1
        zwave_routing : true
        zwave_plus_roletype : ROLE_TYPE_SLAVE_ALWAYS_ON
        zwave_beaming : true
        zwave_secure : false
        zwave_class_specific : SPECIFIC_TYPE_NOTIFICATION_SENSOR
        zwave_manufacturer : 625
        zwave_devicetype : 2