[MC-124722] /team join and /team leave tab-complete all entries from scoreboard including fake players

The bug

/team join and /team leave tab-complete all entries currently stored in the scoreboard including fake players whose names start with #.

/team leave should only tab-complete the names of players / entities which are in the team (currently not the case unless the scoreboard tracks them as well).
(?) Maybe /team join should tab-complete the names of currently online players.

How to reproduce

Create a scoreboard objective and store a value for a fake player

/scoreboard objectives add test dummy
/scoreboard players set #fakePlayer test 1

Type the following
```
/team leave
```
→ ❌ It suggests #fakePlayer

Comments 5

tryashtar 2018-05-21T14:18:46Z

{{/team leave}} doesn't even have an argument for the team – it just removes things from whatever team they may be on. And fake players are allowed to be on teams, so I don't really see the bug unless I'm misunderstanding something.

Avoma 2020-12-26T14:40:47Z

I am unable to reproduce this issue in 20w51a.

Michael Wobst 2020-12-26T15:05:19Z

Because it is blocked by MC-117729.

Avoma 2021-01-29T13:51:23Z

I apologize, I didn't realize.

[Mod] turbo 2023-10-12T11:12:02Z

Blocked by feature request.