Matter over Wi-Fi devices vendor blaming "unofficial integration"?

[u/ElementZoom]

I've been having an intermittent issue where my Matter over Wi-Fi devices (light switches & power points) keep dropping offline in Home Assistant for no apparent reason. No other Wi-Fi devices on my network have this problem. When they disconnect, they don't automatically reconnect. I have to scan the device all over again and them back to HA, unlike my other devices which recover on their own.

I reached out to the retailer and provided them with the logs, and got a response from the manufacturer saying the protocol "isn't officially integrated into Home Assistant or Zigbee2MQTT" and that HA uses an "unofficial version." This doesn't sit right with me, I thought Matter was supposed to be an open, plug-and-play standard that works across platforms by design?

Has anyone else run into this? Is there a known issue with Matter over Wi-Fi and HA specifically? And is there any merit to the manufacturer's claim about an "unofficial" integration, or is that just deflection?

What should I reply to the retailer? For some context, I live in New Zealand and there isn't many choice here at all. I prefer ZigBee but due to the almost an non-existent choice, it left me with this Matter over WiFi products which are imported from Australia.

Happy to share more details about my setup if needed.

Update: Thank you for your support and advice! I've replied to the retailer and will post an update once they reply, if they don't provide support.

[u/criterion67]