After the 'Alt Gr' key is pressed and released the next letter 'a' to be pressed causes the text to be entirely cleared. It affects both text written in chat and in command blocks. It seems to also depend on the keyboard layout itself since it happens on IT layout and not on US layout.

What I expected to happen was...
After the 'Alt Gr' key is released the other keys should behave as they normally do. Letter keys should just put the associated letter.

What actually happened was...
Pressing 'a' after 'Alt Gr' was pressed causes the entire text to just disappear and a letter 'a' to appear in its place. 

Steps to Reproduce:
1. Open the chat (or a command block)
2. Write anything
3. Press 'Alt Gr' for 1-2 seconds (it does not work every time)
4. Press 'a'. Text should be replaced with just 'a'