Chat vs Console command arguments mismatch

[molor]

Expected behavior

Player1 or Console performed command:

/tt 1 2  3   4    5     0

TestPlugin onCommand handler received:

arguments: ["1", "2", "3", "4", "5", "0"]

Observed/Actual behavior

Player1 performed command:

/tt 1 2  3   4    5     0

TestPlugin onCommand handler received:

arguments: ["1", "2", "3", "4", "5", "0"]

Console performed command:

/tt 1 2  3   4    5     0

TestPlugin onCommand handler received:

arguments: ["1", "2", "", "3", "", "", "4", "", "", "", "5", "", "", "", "", "0"]

Steps/models to reproduce

@Override
public boolean onCommand(CommandSender theSender, Command theCommand, String labelString, String[] arguments) {
	if (theCommand.getName().equalsIgnoreCase("tt")) {
		System.out.println("arguments: [\"" + String.join("\", \"", arguments) + "\"]");
		return true;
	}

	return false;
}

Then try to perform tt command with more than 1 space between arguments from game chat and server console and see the difference. This problem can break some plugins which do not expect to see empty strings as the argument value, because you can't send an empty argument from a game chat.

Plugin list

TestPlugin

Paper version

git-Paper-763 (MC: 1.16.5)

Agreements

• I am running the latest version of Paper available from https://papermc.io/downloads.
• I have searched for and ensured there isn't already an open issue regarding this.
• My version of Minecraft is supported by Paper.

Other

No response

[Prof-Bloodstone]

It's weird because I swear I had an issue before with executing commands with too many spaces as player, but might remember it wrong since I can't reproduce.

It's also an issue with rcon - it doesn't strip it either.
Confirmed with grakkit:

core.command({
  name: 'tt',
  execute: (player, ...args) => {
    player.sendMessage("Arguments: " + args)
  }
})

In game:

/tt 1  2   3
Arguments: 1,2,3

Console:

[10:43:52 INFO]: Prof_Bloodstone issued server command: /tt 1 2 3
> tt 1  2   3
[10:45:12 INFO]: Arguments: 1,,2,,,3

RCON:

./rcon-cli 'tt 1  2   3'
Arguments: 1,,2,,,3

This could be caused by chat processing earlier on, where it squashes duplicate whitespace:

I     like     tacos
<Prof_Bloodstone> I like tacos

[molor]

(same on 1.17.1)