NodOn SEM-4-1-00 firmware v15 (01.00.15): power/current/energy stuck at 0 after EV charging session

What happened?

After an EV charging session completes, the NodOn SEM-4-1-00 stops reporting power measurements. All values (power, current, energy) remain frozen at 0 even with a load plugged in.
The device keeps publishing MQTT messages with correct linkquality and voltage, confirming Zigbee connectivity is not the issue.

MQTT payload example when stuck:{"ac_frequency":49.9,"current":0,"energy":206.33,"power":0,"power_apparent":0,"power_factor":1,"linkquality":153,"voltage":227.43}

Workarounds tried:

• Reconfiguring the device via Z2M → does not fix
• Re-interviewing the device → does not fix
• Factory reset of the NodOn → temporarily fixes until next EV charging session
• Physical power cut (circuit breaker off/on) → temporarily fixes

Related to #31790 but different symptom: power stuck at 0W instead of high value.

What did you expect to happen?

Power, current and energy should update normally when a load is plugged in after the EV charging session ends.

How to reproduce it (minimal and precise)

1. Connect EV charger to NodOn SEM-4-1-00
2. Run a full EV charging session (several hours, several kWh)
3. Charging stops — power drops to 0W
4. Plug any other load (e.g. fan) into the NodOn
5. Power remains at 0W, current at 0A, energy counter frozen

Zigbee2MQTT version

2.12.0

Adapter firmware version

20210708

Adapter

Sonoff Zigbee 3.0 USB Dongle Plus (ZStack3x0)

Setup

Add-on on Home Assistant OS, Intel Core i5-9500T x64, 7733MB RAM

Device database.db entry

No response

Debug log

No response

Notes

Device: NodOn SEM-4-1-00, firmware 01.00.15 (v15 — latest available)
Reporting intervals configured: max=3600s on all haElectricalMeasurement attributes
Bug appears systematically after each EV charging session.

Start by reproducing the described EV charging sequence with the NodOn SEM-4-1-00 and observe its MQTT payloads, focusing on the haElectricalMeasurement attributes. Compare reporting before and after the session and investigate the device integration path; done means power, current, and energy update again after another load is connected.