Autofill Broken

When typing a command, the autofill system (default key: TAB) types the O-Macron (ō) instead of autofilling the command.

How to reproduce:

1. Type / in chat.

2. Type an incomplete command.

3. Press TAB on your keyboard.

4. Observe that the O-Macron (ō) appears.

Expected result:
It should autofill the command.

Actual result:
It types the O-Macron (ō) instead of autofilling the command.