Sage 100 2022.6: TAX ERROR after installing PU6 AND when the first line on a SO Order is /C

After installing PU6 for Sage 100 2022 if the first line in a sales order invoice is a /C the customer receives a TAX ERROR. Rebuilding and/or changing the sales tax schedule doesn't fix the issue. If I change the sales tax schedule I receive "Tax Class is missing from tax code XX".

What resolved this was to move the /C line so it is anywhere except the first line on an SO invoice. Once I move the /C then I don't get the error any longer.

This is an existing customer that was previously on 2022 and installed the PU6