Not technically an in-game bug, just a bug with the server broadcasting a /say command. The command sent by the console will not show up in the console, failing to indicate whether it was actually sent or not.
What I expected to happen was...:
For the line [ CONSOLE ] or [ Server ] Hello World! to appear.
What actually happened was...:
The server log gave no indication that a message was sent and the message appeared to disappear from existence.
Steps to Reproduce:
1. In a minecraft server console, type the /say command.
2. Type any text after the command.
3. Hit "Enter" to send the message.
4. Watch as the message shows up in-game and not in the console.