I purchased a Sengled WiFi bulb that supports Matter. No problem adding it to the HA Matter integration. When creating scenes and using those scenes in an automation the bulb rarely did what it was supposed to do (maybe 1 out of 30 times it would work properly within an automation).
Since then I purchased Linkind (Aidot) WiFi bulbs that support Matter and (at least so far) they work as expected in HA scenes and automation.
Problem must be with Sengled bulb