Tracing a parcel fabric which equals to or more than 66 features using construction from the parent workflow does not generate the shape length in the attribute table.
Use the correct workflow as outlined in the help documentation.
https://desktop.arcgis.com/en/arcmap/10.3/manage-data/editing-parcels/copying-and-pasting-linework-as-construction-lines.htm
解决办法
1. Copy features from parcel _line > select the Parcel Fabric data > start an Edit session from the Parcel toolbar > right-click on the selected location > paste > select the 'build all and keep current' option.2. Follow the steps until number 7 from the steps to reproduce > select the Parcel explorer from the Parcel toolbar > Construction > the New Construction window appears > digitize using a construction tool and then to build parcel with keep all current > join parcels.