Transformation service JINJA - Tasmota configured in Home Assistant?

Maybe somebody knows about that issue?

I am just re-installing my mqtt devices (all sonoff/Tasmota with 8.4 firmware), openhab on 2.5.7-1.
I am trying to configure these now in Home Assistant mode (Setoption19 =1)
Before i installed them manually, now with Setoption19 = 1 things immediately pop-up in your PaperUI inbox.

That´s cool!
I also discovered that I still need to set them up in the .items file. Zwave devices don´t need that.

Now my questions:

  1. The things aren´t working correctly, I can switch On but the status isn´t refreshed I assume.
    The log shows something with Transformation service JINJA not found!
    Do I really need to configure that transformation - or do I better leave my fingers away and configure the old manual method?
  2. I realized whatever little change (e.g. location description) I do let the thing go offline. And the only thing what helps is to restart the tasmota device. OK not so critical, but it feels a bit unstable!

Anyone getting the same behaviour?
Anyone also running the devices in Home Assistant mode and is it stable?

2020-08-12 19:32:37.267 [WARN ] [t.generic.ChannelStateTransformation] - Transformation service JINJA for pattern {{value_json.POWER2}} not found!
2020-08-12 19:32:37.269 [WARN ] [ab.binding.mqtt.generic.ChannelState] - Command ‘{“Time”:“2020-08-12T19:32:36”,“Uptime”:“0T01:15:24”,“UptimeSec”:4524,“Heap”:26,“SleepMode”:“Dynamic”,“Sleep”:50,“LoadAvg”:19,“MqttCount”:2,“POWER1”:“OFF”,“POWER2”:“OFF”,“Wifi”:{“AP”:1,“SSId”:“SEK”,“BSSId”:“CC:D4:2E:46:6C:28”,“Channel”:6,“RSSI”:54,“Signal”:-73,“LinkCount”:1,“Downtime”:“0T00:00:03”}}’ not supported by type ‘OnOffValue’: No enum constant org.eclipse.smarthome.core.library.types.OnOffType.{“Time”:“2020-08-12T19:32:36”,“Uptime”:“0T01:15:24”,“UptimeSec”:4524,“Heap”:26,“SleepMode”:“Dynamic”,“Sleep”:50,“LoadAvg”:19,“MqttCount”:2,“POWER1”:“OFF”,“POWER2”:“OFF”,“Wifi”:{“AP”:1,“SSId”:“SEK”,“BSSId”:“CC:D4:2E:46:6C:28”,“Channel”:6,“RSSI”:54,“Signal”:-73,“LinkCount”:1,“Downtime”:“0T00:00:03”}}
2020-08-12 19:33:28.013 [WARN ] [t.generic.ChannelStateTransformation] - Transformation service JINJA for pattern {{value_json[‘RSSI’]}} not found!
2020-08-12 19:33:28.016 [WARN ] [ab.binding.mqtt.generic.ChannelState] - Incoming payload ‘{“Version”:“8.4.0(tasmota)”,“BuildDateTime”:“2020.07.29 12:19:21”,“Module or Template”:“Sonoff Basic”,“RestartReason”:“Software/System restart”,“Uptime”:“0T01:00:17”,“Hostname”:“O-Basic17”,“IPAddress”:“”,“RSSI”:“74”,“Signal (dBm)”:"-63",“WiFi LinkCount”:1,“WiFi Downtime”:“0T00:00:03”,“MqttCount”:2,“LoadAvg”:19}’ not supported by type ‘NumberValue’
2020-08-12 19:33:35.009 [WARN ] [t.generic.ChannelStateTransformation] - Transformation service JINJA for pattern {{value_json.POWER1}} not found!
2020-08-12 19:33:35.011 [WARN ] [ab.binding.mqtt.generic.ChannelState] - Command


I just installed Transformation service JINJA and YES it is working now - Generally at least!
Device status gets updated and I can switch On and OFF.

The only thing is that after I restarted it wasn´t catching all MQTT devices automatically, for what ever reason, but this definately is required I would say.
So I restarted the Tasmota devices one by one and later all were on green in Paper UI again.

Any idea what is causing this?
Why aren´t the devices not updated automatically?
When I cannot solve that behaviour I will re-configure again the manual path… cause I think this isn´t really stable in case of power loss or some other issues what forces a openhab restart.

Hmm even more strange, I restarted again, and as described before the mqtt things getting grey instead of green - but really strange is I still can switch them no problem at all!