We had already agreed to change the optionality for the SN.2 (Num1) component from "O" (optional) to "C" (conditional) as part of V2-25190, however that issue missed part of the predicate. Regardless of whether SN.4 (Num2) is populated, SN.2 is also conditionally required if the SN.1 (Comparator) component is populated. A comparator only makes sense in the context of a specific number; there is no valid use case for having a comparator without at least one number.