There is no bug here at all, just a click-bate headline.
Look at the tampered sign, it is not clear that you are looking at a 35 sign even to a human who has a split second to register road signs.
It is no longer a 3 as the shape of it is not a 3, in fact it is closer to an 8 that has been weathered and the car has correctly decided that the worn text was originally an 8.
Frankly, if you had people tampering with road signs all over the place, autonomous cars would be the least of your problems, what with all their modern safety features.
Biting the hand that feeds IT
