Yeah I thought of that too. My first idea was to keep the anchor dot red and then outline for the LightTable layer but wasn’t sure if it was strange to have the fill/outline essentially reversed from how the outline is displayed. Maybe leave the red dot for current since that’s how they usually appear, then use a gray for previous?
In practice I don’t think differentiating between mark/mark-to-mark will be a big issue. For my own usage, I know that if I saw an unexpected jump in the anchors I would just restore a copy to further investigate regardless of what the anchors actually are.