Depends entirely on the software. If it was confusing and poorly put together such that it was difficult or unclear whose name gets put where and so forth, then there's a case to be made (!) that the lawyer intended and expected the software to do one thing, when it actually did another.
Some things should require human control and agency involved at every step from conception to completion. Even if the software merely enabled such a mistake to be made, that means the software is interacting with a system that is not equipped to handle failure modes gracefully. It's half baked, and as seen, the system can have profound and lasting impact on people's lives. If the stakes are high, the diligence and care have to be escalated as well.
Marriage, divorce, bankruptcy, and other situations should be human only until we are entirely certain that programmatic access is not going to result in hiccups and disruptions.