20AD is the PTP *QBI* loss. The PTP loss that goes into the income calculation is entirely separate. Your K-1 should disclose the PTP portion of the K-1 income and deduction items separately. So if Box 1 is $500, made up of a $50 PTP loss and $550 of non-PTP income, you enter them as if they were two different K-1s.

You may need to request additional information from the K-1 issuer, if they don't have the PTP separately stated.