ANSYS Designmodeler: "Heal" when importing external geometry (e.g., IGES, STEP) can be hazardous

I noticed a wingtip of my bird model (STEP file) is hugely distorted when I set the Heal to Yes when importing external geometry in ANSYS DesignModeler (v 19.1). Therefore, from now on, I will use Heal = No as the first choice. On the other hand, Clean = No almost always fails so I'll be using Clean = Normal as the first choice.