We have encountered challenges with mirroring the Revit model, especially when it comes to windows with slanted or divided designs. This causes errors in the window schedules, as Revit mirrors all elements. However, when the same object is used in a legend, it appears as it originally was, before the mirroring. For example, if you have a window with a sash on the right side and mirror it, the legend will still show the sash on the right side, while the facade shows it on the left side.