Retirement tax questions

I performed an RMD on 1 Jan 2020 and then reversed it in July. So no tax should be applied. Upon entering the 1099-R RMD data and selecting rollover, TurboTax says the income is not taxable. So far, so good. However, the income still shows up on line 4b. It should not be on line 4b, so there appears to be a bug of some kind in the software.