New Snapshots

This may not necessarily be a bug, but the new command system doesn't allow you to use the TAB button in order to auto fill the ID of a block when using the /fill command. It mades it a lot more difficult to use commands like /setblock, /fill, /tp, /clone, etc. If you can look into this I'd really appreciate it. I know I'm not the only one who has this issue with the new updates.