I had this same cenario happen a few years ago and am now experiencing it again in versions 2021 & 2022.  I have tried the steps you posted here but it has not fixed the problem.  I have called 2 times and have 2 support cases opened and have uploaded 4 sample files and cannot get a resolution.  We are in crunch time with tax return preparation staring us down.  We have up to 20 clients that send Accountant's copies each year.  Please find a solution ASAP.