When typing an @a, @p or @r selector in a command and trying to use the "type" selector argument, before typing the equals sign, the chat tab-completes all applicable selector arguments, even though the result of actually tab-completing any of them still results in an invalid argument.

How to reproduce:

1. Open a world with cheats enabled.
2. Open chat and paste this without executing it: /kill @a[type
3. Look at the command suggestions.

Expected result:

The error message "Option 'type' isn't applicable here at position 13: ...ll @a[type<--[HERE]" would appear above the chat box.

Observed result:

The command suggestions box popped up and suggested all applicable selector arguments.