Cloud plus Matter can duplicate a device
A manufacturer cloud integration and local Matter connection may both expose the same accessory.
Bridges can add another path
A bridged device may already be visible before it is separately integrated.
Remove the redundant path carefully
Understand which path provides automations or features before deleting anything.
Keep names consistent
Clear room and device naming makes duplicates easier to identify.
Keep in mind. Compatibility is not permanent. Confirm the current manufacturer, platform and certification information before purchasing, resetting or migrating a device.