Run a regression test java/awt/KeyboardFocusManager/TypeAhead/ButtonActionKeyTest several times. You will see that there always is action performed. In addition, the next text field does receive some parts of this action entourage: always KEY_RELEASED and sometimes KEY_TYPED but never KEY_PRESSED. The arrival of KEY_TYPED is a regression from 6396785.
For me, KEY_TYPED arrives once of four or five times.

Someway reduced test without Robot or synchronization behaves just the same so that's not a Robot issue.