Affects Version/s: 184.108.40.206 Beta
Fix Version/s: 220.127.116.11 Beta
Platform:Windows 10 - PC
Pressing tab to autocomplete does nothing in a command block unless the command is prefixed with a slash.
1. /give @p minecraft:tile.command_block and place it
2. Open it, click the input, and type "sco"
3. Press tab
→ Nothing happens
4. Delete what you typed and type "/sco"
5. Press tab
→ "/scoreboard" is filled in