For some annoying reason Chitubot will consistently generate auto-supports right into the crease of hard angles like in this quick example I made:

I never have this problem with Lychee, but Chitutox does it every time, and it creates a lot of extra work for me to delete the bad ones and create new ones.  Obviously, if I printed them like this they would never snap off cleanly and would leave a mark on the sharp edge.

The problem mainly occurs when there is geometry above the crease that sticks out over it (as in the example there).