Was crashing SculptSession data will not longer be valid if the total number of polys is modified when rendering the mesh again. This deletes all face sets in the mesh when slicing the mask. I'll try to add code to generate a new face set in with faces that are created when filling the holes, but for now this avoids the crash. Reviewed By: brecht Maniphest Tasks: T74500 Differential Revision: https://developer.blender.org/D7049