Missing Sparse Infill (Supporting Layer) for Colored/Painted Internal Geometry Prusa XL (MMU)

[FlashTech]

Description of the bug

Consistently I see missing Extended (#569) or any Sparse Infill under floating internal geometry introduced by MMU Painting or Colored Modifier Parts. This happens easily when coloring sides of a model.

(Image showing example object with color paiting and Colored Modifier Cube)

(Image showing first Layer with internal overhang issue with no Sparse Infill (Supporting Layer))

(Image showing next Layer with internal overhang issue with no Sparse Infill (Supporting Layer))

I was expecting to see something like this to bridge the infill and support the colored/internal geometry:

Project file & How to reproduce

MultiColorMissingSparseInfillExample.zip

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

2.8.1+win64

Operating system

Windows 10

Printer model

Original Prusa XL 5 Tool