Warnings problems of the 2025 Subaru Forester

While backing up into a parking space, my wifes car made contact with a dumpster, which started on the drivers side corner of the rear bumper. The backup sensor did not sound until it was too late. This was a low-speed maneuver that normally would allow for enough reaction time. I (husband) tried a similar maneuver when she got home and encountered a delayed backup sensor notification from both the drivers side and passenger side rear corners of the car. We have small children in our neighborhood, and fear this could have been a child.