Code G is trustee to trustee for rollovers, not conversions. Since the rollover is t-to-t it complies with the 60 day time frame and is reportable, not taxable.

For a conversion the investment house will issue it as Code 1 or Code 7.  If it is Code 1 for being under age 59 1/2 the conversion checkbox will remove the 10% penalty since it does not apply. 

Investment houses are notorious for screwing up the coding.  

This transaction is to follow the facts.  The rollover happened in 2020, the conversion happened in 2021. 

...If you move money from your 401(k) plan to an IRA, that's a rollover. And a Roth conversion occurs when you change a traditional IRA to a Roth IRA. The distinction is important because the IRS treats these transactions differently for tax purposes.