DataNodes can have a color property - so does a LabelSetImage.
For non-LabelSetImages (regular medical images, legacy binary images) the color property can be displayed and changed using the data node context menu inside the data manager. This is not possible with LabelSetImages.

However, the property exists also for LabelSetImages, as can be seen when inspecting the node's properties using the Properties Plugin View. Changing the color property there does not have any visible effect - which makes sense, since the individual label colors of a multi label image / labelsetimage are defined by the label's colors.

I suggest to remove this property for labelsetimages.