I found this little issue today on another one of the tires in this set, not the one with the malformed tread.
It looks like the inside sidewall is thinking about exploding. I noticed this when I pulled the wheel to check for puncture damage as I noticed today that the tire looked a little soft. I had run over a spring clip which was probably causing the leak.
I am a week or two away away from oil change/tire rotation day, so I probably would have noticed it then. But, it makes me wonder how often this happens, just before the tire goes boom. I don't think TPMS would catch this type of failure.
No more Bridgestones for me.
