In Archicad 29, markers now support Renovation Status, aligning them with the Renovation Filter workflow used by model and documentation elements.
Opening a pre-29 project can generate extra marker copies for New, Existing, and Demolished states so markers remain visible in filtered views.
Only one marker is Auto-Rebuild. The others act as static references.
To clean the project, review markers in the Project Map, identify those not Auto-Rebuild, and delete any not required for documentation.