In 7 years wfp use.
I can recall leaving a pole extended to about 15ft against the wall of a custies house when she came out to pay when I was working, it blew over and fell to the floor, with no damage to it or anything else.
Again last year in all the high winds in June I left a pole at 30ft against a building I was cleaning the cladding of and it fell to the floor in a gust of wind.
I understand this risk and don't (almost never
) leave a pole extended and unattended. I actually put it in any risk assessments that we will not leave poles this way.
So I would say the risk is rare.