The direct  portion should be the total prop tax times the business use of home percentage, NOT the entire amount.   And you are supposed to do thru the worksheet in the instructions for F 8829 (as the diagnostic says.   But the ones I've done that on haven't changed.

Direct expenses are not multiplied by the OIH percentage, so your F 8829 couldn't have been correct.

And yes, you must manually put the reciprocal amount manually on Sch A.

Sorta ridiculous for software costing as much as Lacerte does