Aqara FP300 with Matter!

So your Matter-over-Thread device only starts to malfunction when the Homey Aqara app is enabled? This should be reported to the app developer (here: https://community.homey.app/t/app-aqara-xiaomi-smart-home-simplify-your-life-with-a-smarter-home/156) and to Athom support homey.app/support.