I am trying to figure out why sugar alcohols or too many of them knock me out of ketosis?

I know for a fact that I do not get a blood sugar spike since I have tested it a bunch of times but could my body still be producing a lot of insulin from these products even though my blood sugar doesnt go up?

I know I am obviously confused and missing something somewhere but I hope someone can please enlighten me.

From my understanding if my body thought the sugar alcohols were sugar I would get a blood sugar response as well as an insulin response.

Can one happen without the other? Why is the result so dramatic with sugar alcohols?