1.18.2 dedicated server, ubuntu 20.04.3

Player clients: 1.18.2

Issue: when player leaves server, server command line becomes unresponsive. Ctrl+C required to stop server, server no longer responds to commands. Unless server is restarted, players are no longer able to reconnect.

Expected behaviour: when players leave server, server continues to respond to commands in command line

Steps to reproduce:

 - start server

 - player joins server

 - player leaves server

 - try to rejoin server. This is stuck on locating server

 - try to type a command in command line e.g. "list". No response from command line.