https://github.com/bitcoin/bitcoin/blob/9ad6f14175c19b5d47267c3dd5840c14bad43c83/src/validation.cpp#L3711

If i'm following right the flow of the code, when we hit this lane `pindex` should be always equal to nullptr thus this check may be omitted
{
    AssertLockHeld(cs_main);
    assert(lp);
    
    
    if (lp->maxInputBlock) {
        
        
        if (!::ChainActive().Contains(lp->maxInputBlock)) {
            return false;
        }
    }
    
    return true;
}
bool CheckSequenceLocks(const CTxMemPool& pool, const CTransaction& tx, int flags, LockPoints* lp, bool useExistingLockPoints)