Don't Use Coconut oil for Sourdough Bread

I have finally noticed that when my sourdough bread doesn't rise, in other words, fails, it seems to be because I used coconut oil in the dough instead of olive oil or butter or ghee.  Coconut oil really does kill microbes....it must be killing off the natural yeasts in the dough.  I have better outcome with the other fats.  Just a warning, maybe something to this maybe not.