[Question] Websocket Selector Handlers not sync with nacos server list

### Question

When I fiest time register three socket instances into gateway, it will add handlers to the websocket selector, and then I close two instances, the server called 'shenyu.register.service.websocket' in nacos has already remove the two instance from the IP list, but the selector handlers no change.
Is there any configuration items that need to be set?

Start by reviewing the gateway's WebSocket selector handlers and comparing them with the Nacos server list for shenyu.register.service.websocket. Determine whether handler removal is expected when instances close or whether a configuration item controls synchronization. Done means the behavior or required configuration is confirmed and documented.

Written by the indexing model from the issue text.