When I run `scantxoutset` via RPC using big range (e.g. 10000) on XPUB, the progress report indicator (`scantxoutset status`) reports 100% at start (while the keys are being derived). This is most probably the result of the previous operation. The progress is only reset to zero when the actual scan starts. I would expect the progress is set to zero before the keys are being derived.

Output of periodic calls to `scantxoutset status` while performing long operation.

```
{ progress: 100 }
{ progress: 100 }
{ progress: 100 }
{ progress: 100 }
{ progress: 100 }
{ progress: 100 }
{ progress: 100 }
{ progress: 100 }
{ progress: 100 }
{ progress: 0 }
{ progress: 3 }
{ progress: 6 }
{ progress: 9 }
{ progress: 12 }
{ progress: 15 }
{ progress: 17 }
{ progress: 20 }
{ progress: 23 }
{ progress: 26 }
{ progress: 29 }
{ progress: 32 }
{ progress: 35 }
{ progress: 37 }
{ progress: 40 }
{ progress: 43 }
{ progress: 46 }
{ progress: 49 }
{ progress: 51 }
{ progress: 54 }
{ progress: 57 }
{ progress: 60 }
{ progress: 63 }
{ progress: 66 }
{ progress: 68 }
{ progress: 71 }
{ progress: 74 }
{ progress: 77 }
{ progress: 80 }
{ progress: 82 }
{ progress: 85 }
{ progress: 88 }
{ progress: 91 }
{ progress: 94 }
{ progress: 97 }
{ progress: 100 }
```
{
                            {"height", RPCArg::Type::STR, RPCArg::Optional::OMITTED, "Selected statistic"},
                            {"time", RPCArg::Type::STR, RPCArg::Optional::OMITTED, "Selected statistic"},
                        },
                        "stats"},
                },
                RPCResult{
            RPCResult::Type::OBJ, "", "",
            {
                {RPCResult::Type::NUM, "avgfee", "Average fee in the block"},
                {RPCResult::Type::NUM, "avgfeerate", "Average feerate (in satoshis per virtual byte)"},
                {RPCResult::Type::NUM, "avgtxsize", "Average transaction size"},
                {RPCResult::Type::STR_HEX, "blockhash", "The block hash (to check for potential reorgs)"},
                {RPCResult::Type::ARR_FIXED, "feerate_percentiles", "Feerates at the 10th, 25th, 50th, 75th, and 90th percentile weight unit (in satoshis per virtual byte)",
                {
                    {RPCResult::Type::NUM, "10th_percentile_feerate", "The 10th percentile feerate"},
                    {RPCResult::Type::NUM, "25th_percentile_feerate", "The 25th percentile feerate"},
                    {RPCResult::Type::NUM, "50th_percentile_feerate", "The 50th percentile feerate"},
                    {RPCResult::Type::NUM, "75th_percentile_feerate", "The 75th percentile feerate"},
                    {RPCResult::Type::NUM, "90th_percentile_feerate", "The 90th percentile feerate"},
                }},
                {RPCResult::Type::NUM, "height", "The height of the block"},
                {RPCResult::Type::NUM, "ins", "The number of inputs (excluding coinbase)"},
                {RPCResult::Type::NUM, "maxfee", "Maximum fee in the block"},
                {RPCResult::Type::NUM, "maxfeerate", "Maximum feerate (in satoshis per virtual byte)"},
                {RPCResult::Type::NUM, "maxtxsize", "Maximum transaction size"},
                {RPCResult::Type::NUM, "medianfee", "Truncated median fee in the block"},
                {RPCResult::Type::NUM, "mediantime", "The block median time past"},
                {RPCResult::Type::NUM, "mediantxsize", "Truncated median transaction size"},
                {RPCResult::Type::NUM, "minfee", "Minimum fee in the block"},