Google Chrome	70.0.3511.0 (Official Build) canary (64-bit)
Firmware Version	Google_Eve.9584.160.0

Steps:
# ChromeVox to put focus on an item. In this case, I used the NTP page, voice search icon since it is in the tab order 
# Invoke the context menu using search + m
# Collapse the context menu back by pressing esc
Expected: focus lands back on object that previously had focus
Actual: focus is in ambiguous place, the highlight ring is still around the area where the context menu used to be

Once you press another button to move the focus, it works as expected.