Bug: Backspace in editor triggers delete

Google Chrome 71.0.3578.98 (Official Build)
WordPress 5.03

Description: When adding markers to the map via the search box, a backspace keypress will trigger the “delete” action if a saved spot is already present, displaying an alert box saying, “Are you sure you want to delete this spot?”

Expected behavior: Backspacing should just delete the characters in the search box.

Steps to reproduce:
From the map editing screen:
1) Add a spot via the search bar (top left), and press “save”
2) Begin typing to add a second spot
3) Press backspace to delete a character; character will delete, but also the alert box will pop up