I have the same issue. It's an endless loop of "fixing" the error (that doesn't appear to exist) and then hitting the error again when trying to Netfile. When will this be fixed?

I have given up.  Going to just print it and mail it in.  Same issue.

@TylerWeeks We are aware of the issue, and our team is working on getting this resolved.

For now, try this workaround: A workaround involves returning to the Tax Home, re-entering the Principal Residence topic, editing the property, and then proceeding through the flow. If the proceeds of disposition for the taxpayer or spouse/partner are missing from the Sale of Principal Residence Summary step (s_sold_principal_residence_sum) after completing the flow, the user must re-enter the property and subsequently remove the initial entry from the summary.

Someone told me they deleted that form and then added it, and it worked for them, and it worked for us too!

@letchy18 Thanks for the update; we appreciate it!