I had this bug in Rhino 8 Beta but continue to have it in commercial. Objects in a layer with the “New Detail” lightbulb set to “off” will all of a sudden appear in all my details. The setting on the layer remains “off”. Forces me to manually turn off the layer in every single detail. It seems to be triggered by copying and pasting a detail in layout space. cntrl Z right after doesnt fix it. Happens very occasionally, not all the time.