Opening chat window with "/" places cursor before "/"

When you use "/" to open the chat window in order to enter a command, the cursor appears to be placed after the "/" that is entered. However, whatever you type is inserted before the "/". It doesn't happen every time, but is very common. This is very inconvenient and annoying.

Steps to reproduce
1. In any world, type a / on the keyboard.
2. Type anything. Observe that it is inserted before the /.