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When two heroes meet, the left/right arrow keys on the keyboard do not work for exiting the control window. They should duplicate the functionality of the buttons located in the lower corners of the window; the buttons work, but the keys don't.
This bug has carried over from HW Rules; I wrote about it
here. Since HW Rules is no longer a plugin and is now directly integrated into the game, there is no way to get rid of this bug. Even if you disable them in the settings window that appears in the final stage before map generation (the icon with a crossed-out circle next to the text "HW Rules"), the bug remains.