Bug: Modifiers force a color change for MMU slicing

[LewnWorx]

Version

2.3.0

Operating system type + version

Mac OS 13.x
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3D printer brand / version + firmware version (if known)

Prusa I3MK2S + MMUI

Behavior

If I add a modifier (say a cylinder to locally increase perimeters for a heat set insert around a hole for example) Slicer forces me to pick an extruder even though it’s a modifier which then overrides the color(s) for the geometry in the area it occupies on the model.

This is a slicing parameter modifier only, it should not behave as a color override in these cases. IS there a workaround for this, or am I missing something. I could not find a way to have it not force a color change to the entire volume the modifier occupied, which kind of breaks the MMU aspect of the print. In this case I was able to kludge around it as the color changes were in the vertical plane, and occupied the entire xy area around the cylinder, so I ended up using 2 modifiers stacked at the color change, however that is not idea, and in many models would not work at all. There needs to be a way of turning off the color of the modifier and have it just apply the parameter in question one is trying to apply.

[bubnikv]

This will be fixed in PrusaSlicer 2.4.0-alpha1.
The "Default" extruder will become transparent for modifier meshes and layer range modifiers.