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 }
```
{
    return EnsureMemPool(EnsureAnyNodeContext(context));
}
ChainstateManager& EnsureChainman(const NodeContext& node)
{
    if (!node.chainman) {
        throw JSONRPCError(RPC_INTERNAL_ERROR, "Node chainman not found");
    }
    return *node.chainman;
}
ChainstateManager& EnsureAnyChainman(const std::any& context)
{
    return EnsureChainman(EnsureAnyNodeContext(context));
}
CBlockPolicyEstimator& EnsureFeeEstimator(const NodeContext& node)
{
    if (!node.fee_estimator) {
        throw JSONRPCError(RPC_INTERNAL_ERROR, "Fee estimation disabled");
    }
    return *node.fee_estimator;
}
CBlockPolicyEstimator& EnsureAnyFeeEstimator(const std::any& context)
{
    return EnsureFeeEstimator(EnsureAnyNodeContext(context));
}
/* Calculate the difficulty for a given block index.
 */
double GetDifficulty(const CBlockIndex* blockindex)