the placeholder names from the player info list appear when pressing tab in the chat

That is from Vanilla.

Or do you mean that we should add a feature to filter these out? I'm guessing that can be tricky, but it probably possible somehow.

That is from Vanilla.

Or do you mean that we should add a feature to filter these out? I'm guessing that can be tricky, but it probably possible somehow.

idk maybe in the minecraft source code would be something?

you could filter the players with a blank tab display name

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