Inpainting: Mask Maintaining Color Data?

[JLuke73]

InvokeAI describes a very specific implementation of masking required to retain color data and properly match underlying colors. Right now, I'm getting a "cut-and-paste" effect without color or pixel value data when I inpaint using NMKD GUI. Two questions:

1. Is the mask being applied & passed as transparency alpha channel?
2. Alternatively, are the -I and -M switches being passed to the model?

Source: https://github.com/invoke-ai/InvokeAI/blob/main/docs/features/INPAINTING.md