There is a race condition in SelectorMonitor and TlsChannelStream:

• If MongoClient.close() is called, consequently closing the SelectorMonitor while an OP_CONNECT event is still pending, the underlying SocketChannel remains open and is never closed.
• Similarly, if there are entities in pendingRegistrations, their associated sockets are also not closed.

This leads to resource leaks (e.g., TCP connections remaining ESTABLISHED after client shutdown). The fix should ensure proper cleanup of pending events and registrations during MongoClient.close().

This bug is different from JAVA-5895.