Colon Included in Message When Typing Subcommand

When you type a subcommand and then type colon ( : ), it includes that in your message. I know you can use tab or space, but when you type a colon, it includes that colon in the message. So then you have to delete the colon that was included in the message.

Ideally since a colon is used with the subcommand anyway, it should not be included in the actual message.

How to reproduce:

1.) Type a subcommand, end with a colon

Example: https://i.imgur.com/Vp6ZwsZ.gif