`ScanForWalletTransactions()` has the following comment about its return value:

```
 * Returns null if scan was successful. Otherwise, if a complete rescan was not
 * possible (due to pruning or corruption), returns pointer to the most recent
 * block that could not be scanned.
```

This is not strictly true. If `abortrescan` is called, then `ScanForWalletTransactions()` will return `nullptr`, even though the scan wasn't successful to the tip.

This in turn causes a minor bug in `importmulti`, where the call doesn't return the correct error and warning about potentially not finding transactions if `abortrescan` was called.

I think the correct fix is for `ScanForWalletTransactions()` to inform the caller that the rescan was aborted.
auto locked_chain = chain().lock();
    LOCK(cs_wallet);
    for (const CTransactionRef& ptx : pblock->vtx) {
        SyncTransaction(ptx);
    }
}
void CWallet::BlockUntilSyncedToCurrentChain() {
    AssertLockNotHeld(cs_main);
    AssertLockNotHeld(cs_wallet);
    {
        
        
        
        
        
        auto locked_chain = chain().lock();
        const CBlockIndex* initialChainTip = chainActive.Tip();
        if (m_last_block_processed && m_last_block_processed->GetAncestor(initialChainTip->nHeight) == initialChainTip) {
            return;
        }
    }
    
    
    
    SyncWithValidationInterfaceQueue();
}
isminetype CWallet::IsMine(const CTxIn &txin) const