Yes, it is correct that line 4 is blank because Form 8606 states "In 2020, did you take a distribution from traditional, SEP, or SIMPLE IRAs, or make a Roth IRA conversion?" if no "Enter the amount from line 3 on line 14". Your conversion happened in 2021 and therefore your answer would be no and line 4 stays blank.
No, the rules for conversion are the same for 2020 and 2021.
@barathvasu
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