Hi all. I am trying to see if i can get a workflow to use existing lines (in cases where an existing parcel shares a boundary with an active record/new parcel). To do this, I have been trying to use the "copy lines to" tool in the ribbon on pro (see below).

However, every time that I've tried to do this, it leads to a "Lines in the map extent do not form valid closed loops or all seeds already exist." I do not believe i should be getting this error because if I build the boundary by tracing with the line with the create features tool, or traverse the bearing and distance and then manually align the vertices, i do not get this error.
Here is an example parcel of when this happens:

Using the vertices and nodes tool, I also don't see any errors, but it just refuses to create the seeds and build active. Our customers really want this functionality as they want to be able to copy lines from existing parcels so they don't have to manually create all of the lines individually when they might already be existing and can just be copied. Is this a supported functionality? Am i misinterpreting what this tool does?