Tasmota Light flickering when turning off when HomeKit command issued

[SoWizard]

I've got a Tasmota light with colour temperature control running through homebridge-mqttthing. Config:

        {
            "type": "lightbulb-ColTemp",
            "name": "Bathroom Ceiling",
            "username": "***",
            "password": "***",
            "mqttOptions": {
                "keepalive": 30
            },
            "logMqtt": true,
            "topics": {
                "getOnline": "tele/tasmota_x/LWT",
                "setOn": "cmnd/tasmota_x/POWER",
                "getOn": {
                    "topic": "stat/tasmota_x/RESULT",
                    "apply": "return JSON.parse(message).POWER;"
                },
                "setBrightness": "cmnd/tasmota_x/Dimmer",
                "getBrightness": {
                    "topic": "stat/tasmota_x/RESULT",
                    "apply": "return JSON.parse(message).Dimmer;"
                },
                "setColorTemperature": "cmnd/tasmota_x/CT",
                "getColorTemperature": {
                    "topic": "stat/tasmota_x/RESULT",
                    "apply": "return JSON.parse(message).CT;"
                }
            },
            "onlineValue": "Online",
            "offlineValue": "Offline",
            "onValue": "ON",
            "offValue": "OFF",
            "minColorTemperature": 153,
            "maxColorTemperature": 500,
            "accessory": "mqttthing"
        },

It works perfectly when I click on the switch in Home.app to flick it on/off:

These are the respective commands displayed the Homebridge log:

9/3/2023, 4:41:18 PM] [Bathroom Ceiling] Publishing MQTT: cmnd/tasmota_x/POWER = OFF
[9/3/2023, 4:41:18 PM] [Bathroom Ceiling] Received MQTT: stat/tasmota_x/RESULT = {"POWER":"OFF"}
[9/3/2023, 4:41:18 PM] [Bathroom Ceiling] apply() function decoded message to [OFF]
[9/3/2023, 4:41:18 PM] [Bathroom Ceiling] apply() function decoded message to [undefined]
[9/3/2023, 4:41:18 PM] [Bathroom Ceiling] apply() function decoded message to [undefined]

And in Tasmota:

06:04:51.430 MQT: stat/tasmota_x/RESULT = {"POWER":"OFF"}
06:04:51.435 MQT: stat/tasmota_x/POWER = OFF

Now I have a Siri Shortcut Automation setup as an action for the push-button switch. Purpose is to toggle the light on/off. It uses simple logic. The CT values are unchanged when this shortcut is activated, i.e., in Home.app they do not differ. I only set my lights at the same CT and don't change it.

The issue is that when I run this, the Tasmota light flickers and changes temperature as it turns off. It's a really jarring experience.

When you look at the logs you can see why: this Siri Shortcut doesn't just send a power on/off signal, but rather the whole desired state of the light.

In Homebridge:

[9/3/2023, 4:56:08 PM] [Bathroom Ceiling] Publishing MQTT: cmnd/tasmota_x/POWER = OFF
[9/3/2023, 4:56:08 PM] [Bathroom Ceiling] Publishing MQTT: cmnd/tasmota_x/CT = 489
[9/3/2023, 4:56:08 PM] [Bathroom Ceiling] Publishing MQTT: cmnd/tasmota_x/Dimmer = 0
[9/3/2023, 4:56:08 PM] [Bathroom Ceiling] Received MQTT: stat/tasmota_x/RESULT = {"POWER":"OFF"}
[9/3/2023, 4:56:08 PM] [Bathroom Ceiling] apply() function decoded message to [OFF]
[9/3/2023, 4:56:08 PM] [Bathroom Ceiling] apply() function decoded message to [undefined]
[9/3/2023, 4:56:08 PM] [Bathroom Ceiling] apply() function decoded message to [undefined]
[9/3/2023, 4:56:08 PM] [Bathroom Ceiling] Received MQTT: stat/tasmota_x/RESULT = {"POWER":"ON","Dimmer":100,"Color":"08F7","White":100,"CT":489,"Channel":[3,97]}
[9/3/2023, 4:56:08 PM] [Bathroom Ceiling] apply() function decoded message to [ON]
[9/3/2023, 4:56:08 PM] [Bathroom Ceiling] apply() function decoded message to [100]
[9/3/2023, 4:56:08 PM] [Bathroom Ceiling] apply() function decoded message to [489]
[9/3/2023, 4:56:08 PM] [Bathroom Ceiling] Received MQTT: stat/tasmota_x/RESULT = {"POWER":"OFF","Dimmer":0,"Color":"0000","White":0,"CT":489,"Channel":[0,0]}
[9/3/2023, 4:56:08 PM] [Bathroom Ceiling] apply() function decoded message to [OFF]
[9/3/2023, 4:56:08 PM] [Bathroom Ceiling] apply() function decoded message to [0]
[9/3/2023, 4:56:08 PM] [Bathroom Ceiling] apply() function decoded message to [489]

In Tasmota:

07:53:35.964 MQT: stat/tasmota_x/RESULT = {"POWER":"OFF"}
07:53:35.967 MQT: stat/tasmota_x/POWER = OFF
07:53:36.020 MQT: stat/tasmota_x/RESULT = {"POWER":"ON","Dimmer":100,"Color":"08F7","White":100,"CT":489,"Channel":[3,97]}
07:53:36.069 MQT: stat/tasmota_x/RESULT = {"POWER":"OFF","Dimmer":0,"Color":"0000","White":0,"CT":489,"Channel":[0,0]}

The questions are:

• Why does homebridge-mqttthing/HomeKit need to send POWER, CT, and DIMMER? Why not just the POWER signal?
• Is it a setup problem with the Siri Shortcut? If so, is there a way to just send the POWER or DIMMER signal without the rest?
• Lastly, if it's not the above then is it a bug with homebridge-mqttthing that could be causing this?

Let me know if y'all need more info :)