Tasmota sonoff TH16 Power ON after restart! Randomly switches on also

Configuration
1

Been having this issue for about 18 months now.

This TH16 with tasmota 10 will switch on randomly and also always POWER ON after a system restart.

Retain is set as false (in HA also). poweronstate 3 (tried the other options also)
Tried virtually everything.

After a system restart I see this line even if the switch is OFF before restarting:

  "MqttCount": 1,
  "POWER": "ON"

Config is identical to another TH16 I have which works as normal.

Now my mqtt broker is set as
persistence true
(LXC container in proxmox)

Any other suggestions apart from wiping it and reconfiguring?
Thanks

2

Just captured the last messages when it switched on by itself again:

15:38:07.839 WIF: Connecting to AP2 SSID Channel 3 BSSId 90:9A:4A:50:6C:A6 in mode 11n as tasmota-TH16-sensor2-6263...
15:38:10.753 WIF: Connected
15:38:11.027 MQT: Attempting connection...
15:38:11.075 MQT: Connected
15:38:11.079 MQT: tele/tasmota_TH16_sensor2/LWT = Online (retained)
15:38:11.082 MQT: cmnd/tasmota_TH16_sensor2/POWER = 
15:38:11.370 MQT: stat/tasmota_TH16_sensor2/RESULT = {"POWER":"ON"}
15:38:11.375 MQT: stat/tasmota_TH16_sensor2/POWER = ON (retained)
15:38:12.124 MQT: stat/tasmota_TH16_sensor2/RESULT = {"Time":"2022-06-15T15:38:12","Uptime":"0T00:44:11","UptimeSec":2651,"Heap":27,"SleepMode":"Dynamic","Sleep":50,"LoadAvg":19,"MqttCount":2,"POWER":"ON","Wifi":{"AP":2,"SSId":"SSID","BSSId":"90:9A:4A:50:6C:A6","Channel":3,"Mode":"11n","RSSI":92,"Signal":-54,"LinkCount":2,"Downtime":"0T00:00:09"}}
15:38:12.174 MQT: stat/tasmota_TH16_sensor2/STATUS10 = {"StatusSNS":{"Time":"2022-06-15T15:38:12","AM2301":{"Temperature":19.8,"Humidity":78.0,"DewPoint":15.8},"TempUnit":"C"}}
3

Think I may have solved it by following the advice here

I published an empty payload from HA services with retain