Zigbee nodes are listed but not in otaupgrade

I use the openhab console to force an otaupdate of my Ikea Inspelnig plugs.
(as described in: I don’t understand Zigbee OTA, can someone help? )

These are the 4 connected inspelning plugs:

openhab> zigbee nodes
Total known nodes in network: 6
Network  Addr  IEEE Address      Logical Type  State      EP   Profile                    Device Type                Manufacturer     Model          
      0  0000  E0798DFFFEB8DDB6  COORDINATOR   ONLINE   
   4643  1223  94EC32FFFE0049A5  ROUTER        ONLINE      1  ZIGBEE_HOME_AUTOMATION     ON_OFF_PLUG_IN_UNIT        IKEA of Sweden   INSPELNING Smart plug
                                                         242  ZIGBEE_GREEN_POWER         0061                                                       
  18164  46F4  001788010D2AA639  END_DEVICE    ONLINE      1  ZIGBEE_HOME_AUTOMATION     NON_COLOR_SCENE_CONTROLLER  Signify Netherlands B.V.  RWL022         
  18721  4921  C4D8C8FFFEFFB5FC  ROUTER        ONLINE      1  ZIGBEE_HOME_AUTOMATION     ON_OFF_PLUG_IN_UNIT        IKEA of Sweden   INSPELNING Smart plug
                                                         242  ZIGBEE_GREEN_POWER         0061                                                       
  48661  BE15  C4D8C8FFFEEEE166  ROUTER        ONLINE      1  ZIGBEE_HOME_AUTOMATION     ON_OFF_PLUG_IN_UNIT        IKEA of Sweden   INSPELNING Smart plug
                                                         242  ZIGBEE_GREEN_POWER         0061                                                       
  49788  C27C  C4D8C8FFFEEF01B3  ROUTER        ONLINE      1  ZIGBEE_HOME_AUTOMATION     ON_OFF_PLUG_IN_UNIT        IKEA of Sweden   INSPELNING Smart plug
                                                         242  ZIGBEE_GREEN_POWER         0061                                                       

Then I would like to know the update status, but only one node is showing:

openhab> zigbee otaupgrade
Address    Ieee Address      State     
BE15/1     C4D8C8FFFEEEE166  OTA_UPGRADE_COMPLETE

openhab> zigbee otaupgrade state 48661                                                                                                                                    
OTA Upgrade configuration for BE15/1
Current state    : OTA_WAITING
Firmware Version : 02040045

Why is only this node showing?
Other nodes give an error:

openhab> zigbee otaupgrade state 18721                                                                                                                                    
Error: Exception during command execution (IllegalArgumentException): Node 18721 does not implement the OTA Upgrade server

For reference: these are all the exact same plugs:

Summary
openhab> zigbee info 4643/1
Requesting ZCL Version
Requesting Application Version
Requesting Stack Version
Requesting HW Version
Requesting Manufacturer Name
Requesting Model Identifier
Requesting Date Code
Requesting Power Source
Requesting Generic Device Class
Requesting Generic Device Type
Requesting Product Code
Requesting Product URL
Requesting Location Description
Requesting Physical Environment
Requesting Device Enabled
Requesting Alarm Mask
Requesting Disable Local Config
Requesting SW Build ID
Requesting Cluster Revision
Requesting Attribute Reporting Status
Device information for endpoint 1223/1
Node Info             Value
Application Version   2
Cluster Revision      3
Date Code             20240801
Generic Device Class  0
Generic Device Type   5
HW Version            1
Manufacturer Name     IKEA of Sweden
Model Identifier      INSPELNING Smart plug
Power Source          1
Product Code          ByteArray [value=45 32 32 30 36]
Product URL           www.ikea.com
SW Build ID           2.4.45
Stack Version         114
ZCL Version           8

openhab> zigbee info 18721/1
Requesting ZCL Version
Requesting Application Version
Requesting Stack Version
Requesting HW Version
Requesting Manufacturer Name
Requesting Model Identifier
Requesting Date Code
Requesting Power Source
Requesting Generic Device Class
Requesting Generic Device Type
Requesting Product Code
Requesting Product URL
Requesting Location Description
Requesting Physical Environment
Requesting Device Enabled
Requesting Alarm Mask
Requesting Disable Local Config
Requesting SW Build ID
Requesting Cluster Revision
Requesting Attribute Reporting Status
Device information for endpoint 4921/1
Node Info             Value
Application Version   2
Cluster Revision      3
Date Code             20240215
Generic Device Class  0
Generic Device Type   5
HW Version            1
Manufacturer Name     IKEA of Sweden
Model Identifier      INSPELNING Smart plug
Power Source          1
Product Code          ByteArray [value=45 32 32 30 36]
Product URL           www.ikea.com
SW Build ID           2.4.34
Stack Version         114
ZCL Version           8

openhab> zigbee info 48661/1                                                                                                                                        
Requesting ZCL Version
Requesting Application Version
Requesting Stack Version
Requesting HW Version
Requesting Manufacturer Name
Requesting Model Identifier
Requesting Date Code
Requesting Power Source
Requesting Generic Device Class
Requesting Generic Device Type
Requesting Product Code
Requesting Product URL
Requesting Location Description
Requesting Physical Environment
Requesting Device Enabled
Requesting Alarm Mask
Requesting Disable Local Config
Requesting SW Build ID
Requesting Cluster Revision
Requesting Attribute Reporting Status
Device information for endpoint BE15/1
Node Info             Value
Application Version   2
Cluster Revision      3
Date Code             20240215
Generic Device Class  0
Generic Device Type   5
HW Version            1
Manufacturer Name     IKEA of Sweden
Model Identifier      INSPELNING Smart plug
Power Source          1
Product Code          ByteArray [value=45 32 32 30 36]
Product URL           www.ikea.com
SW Build ID           2.4.34
Stack Version         114
ZCL Version           8

openhab> zigbee info 49788/1
Requesting ZCL Version
Requesting Application Version
Requesting Stack Version
Requesting HW Version
Requesting Manufacturer Name
Requesting Model Identifier
Requesting Date Code
Requesting Power Source
Requesting Generic Device Class
Requesting Generic Device Type
Requesting Product Code
Requesting Product URL
Requesting Location Description
Requesting Physical Environment
Requesting Device Enabled
Requesting Alarm Mask
Requesting Disable Local Config
Requesting SW Build ID
Requesting Cluster Revision
Requesting Attribute Reporting Status
Device information for endpoint C27C/1
Node Info             Value
Application Version   2
Cluster Revision      3
Date Code             20240215
Generic Device Class  0
Generic Device Type   5
HW Version            1
Manufacturer Name     IKEA of Sweden
Model Identifier      INSPELNING Smart plug
Power Source          1
Product Code          ByteArray [value=45 32 32 30 36]
Product URL           www.ikea.com
SW Build ID           2.4.34
Stack Version         114
ZCL Version           8

Out of the box these plugs have an outdated firmware, this firmware shows all numbers divided by 10 (voltage is reported as 24.7). So all of them need a firmware update. It is a bit strange that only one of them shows up.

So, if anyone could give me some pointers:
I would really like a fix as I plan to add more INSPELNING plugs.