I tried to slice a file today for my M200 and parts of it disappeared. Supports were automatically added to fill in for the missing material. I tried different layer thickness with the same result. Just for fun I sliced the file as an M200 Plus and an M300, and got the same result. I tried with both Z-PCABS and external PCABS settings.
I then tried slicing with different materials selected (Z-ABS, Z-PETG, Z-HIPS) and it came out just fine.
whoop_chrome_v3.stl (2.1 MB)