On OS X Chrome 56.0.2924.87, using "down arrow" to select autocomplete choice behaves incorrectly

[RickMohr]

@jwalgran reports:

Using the down arrow to navigate the autocomplete suggestions

• In the location box type "phila". The autocomplete list will show neighborhood suggestions. The first three are "Philadelphia," "Northeast Phila Airport," and "South Philadelphia"
• Type the key 3 times. "South Philadelphia" is highlighted.
• Type

Expected: The South Philadelphia neighborhood boundary is shown
Actual: The Philadelphia county boundary is shown.

... and later:
I am seeing slightly different behavior now. It correctly selects and zooms to the 3rd region, but then immediately selects and zooms to the first region. The back button history has both regions. I captured a GIF of it.

[jwalgran]

I changed the title because it did work correctly in Safari. The animation was created with Chrome 56.0.2924.87 on OS X 10.11.6

[RickMohr]

Note this is not a problem on OSX Safari or Firefox, or on Windows Chrome.