If you have the means to open the .tax2019 file, you need to check the status of that asset. Sounds to me like it was marked as no longer being a rental asset at some point during the 2019 tax year. You could have marked it as sold, given away, converted to personal use or any number of things that would make it no longer be a business asset.
For example, if when working through that asset last year on your 2019 return, if you were presented a screen that asked "Special Handling Required"? on that particular asset, that would indicate that you either sole it, converted it to personal use, gave it away, are something else. It wouldn't matter if you answered the "Special handling required?" question with a yes or a no either.
If you have a printout of the IRS form 4562 from the 2019 return, that would let you know it's status also. There are three 4562's for that property. One prints in portrait format and that's not the one you want to look at. The other two print in landscape format, and you want the one titled "Depreciation and Amortization Report".
If the numbers in the "Cost (Net of Land)" column and the "Depreciation Basis" column for that asset do not match, then the property was not "in service" as a business asset at the end of the 2019 tax year, and you have a possible error/problem on your 2019 tax return concerning that asset also.
