As a workaround to prevent these missing parts, please try to:
- always use reconstruction region
- set Minimal distance between two vertices (Reconstruction settings - Mesh calculation) to some value, e.g. 0.001
- Raise the number of Maximal vertex count per part (Reconstruction settings - Advanced) to higher value, e.g. 10M or 20M
- If there are still missing parts, please try to change the RECONSTRUCTION REGION slightly, say +10-15 % bigger and rotate it by say 10-15 degrees.