Unable to create new mask volume in segment editor

[allenm518]

Summary

After working with a scene in Slicer that involves segmentation and creating a masked volume, when adding new volumes or creating a new scene, I am unable to create additional new mask volumes. The drop down options in Output Volume in the Mask Volume module are only the original volume (which would overwrite the volume I am working with) or Scene (which does not seem to do anything). In order to create a second masked volume and not overwrite the original volume, I either have to load the original volume again so there are two, or restart slicer and reload the scene. After restarting, the function works correctly during the first scene, but if I create or open a second scene, the mask volume create new scene option disappears until restarting.

Steps to reproduce

1. Open/Create a new scene
2. Create segment (or use existing segment)
3. Mask volume module
4. Set output volume to create new volume
5. Create masked volume and proceed as needed from there
6. Close scene
7. Load new volumes/open scene
8. Create segment
9. Mask volume module
10. No option to create new volume in output volume drop down => should be option to create new volume
11. Restart Slicer
12. Reopen scene
13. Mask volume - Slicer correctly has option for create new volume

This is what I see when I work with a second scene and attempt to create a new mask volume:

Environment

• Slicer version: Slicer-5.6.1, and had issue in 5.5 as well
• MacOS Monterey 12.7.2