Killied a characte piece can't be added back in

[hobnob]

Affected Scenario(s): All

Describe the bug
Killing a player piece doesn't result in them being added to the 'Add Piece' menu

To Reproduce
Steps to reproduce the behavior:

1. Load a scenario
2. Play with client / server
3. Kill a player piece
4. Notice it doesn't appear in the 'Add Piece' menu

Browser : Firefox