The 2019 return should show the combined losses carried forward. In other words the 2019 QBI loss component should have both year's included if there was an overall loss in 2018 as well as 2019. There may be confusion where 2018 may be displayed for the 2019 amount (this may have been corrected, I am unable to see this for the prior year).
As I indicated earlier, you should find it on Form 8995 or 8995-A in your 2019 tax return. Use the QBI Deduction Summary page from your prior year (2019) return.
@EliC
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