Perfectly Normal people, As has been indicated by many above: Alpha Prot is a function of loading and to that end, it is indicated regardless of green dot.
This is an issue almost every time we enter a holding pattern and commence a turn at the same time, my personal minimum is to never fly in to a holding pattern at anything less than green dot plus ten knots.
It amazes me how many people are surprised by it. The FBW technology is good but far from perfect.