Chat problem when typing "A" key.

How to recreate:

Open 18w31a, install the German keyboard layout on your Windows 10 Laptop. Then type:

/summon tnt ~ ~ ~ {unsta

(You can tab-complete when typing "tnt")

At the moment you type the "a" key, everything gets deleted and only "a" remains

And also there are many problems with auto-completion

Attachments:

https://youtu.be/FY_3oxm9R-I