A Bluetooth proxy that lost power could leave Matter.js Server believing it was still connected, keeping the devices it had reported assigned to a connection that no longer worked. The server checks for a response every 15 seconds and removes an unresponsive proxy within 45 to 60 seconds.
Ingo Fischer’s correction also prevents a delayed response from reviving a connection after setup has timed out. This is Matter.js Server connection cleanup; updating the list of devices offered for Matter setup needs separate work.