You have to toggle it off and on multiple times per day, the more motion there is in the greyed out area, the more frequently the bug surfaces and you have to toggle it. Modifying the detection zone also accomplishes the same thing but still only temporary, and takes more effort.
I’m considering trying to set a rule to disable and re-enable motion detection for like 1 minute every hour and see if that keeps the bug at bay until a fix comes along. I haven’t tested yet if disabling and re-enabling motion detection temporarily fixes it like toggling detection zone is, will try it tomorrow. In your case, you may just want to tilt the camera down to exclude the street until there is a fix.
In my observations, I’ve never seen a green box from outside the zone cause it to detect that motion. It works the other way around, when motion is detected, it tags it with the green box. If the motion is in the excluded zone, there is no green box.