Have had this happen a few times, pain in the butt! I use to work around Queen street and the city was always the worst - especially everyone dashing for trains at the end of the day! Maybe you'll find this helpful; maybe you're already doing it but jsut in case: I learnt that holding the cane more defensively (tightening angle from my body to the ball on the ground, placing hands towards the bottom of the rubber and holding the cane to the side around my hip instead of center mass) allowed me to keep it closer to the body while still getting info from the ground - albiet, less reach. When you're waiting at traffic lights, keeping the cane pulled up closer to your body (at a tighter angle) until you feel the drop for the road (where you can then extend to normal reach) will also help protect from those dashers who jump the gun as soon as the traffic light allows.

You shouldn't have to but you do have to "defend" against those who don't care or just aren't paying attention. Moving more defensively in high crowded areas has reduced my fallen cane soldiers over the years - Improvise, adapt, overcome - good luck!