In previous versions the following could be used to send a server password:
/server <server>:<port> <pass>
/server <server> <port> <pass>
Now the following is required in the latest beta, where "-l pass" is literal text:
/server <server:port> <pass> -l pass
This breaks backwards compatibility, and seems obtuse compared to how most builtin commands work, so I assume the change is unintented