accountTxPage skips the marker transaction instead of resuming after it (forward pagination)
In RWDBDatabase::accountTxPage forward path, when the marker is found (findLedger == ledgerSeq && findSeq == txnSeq), lookingForMarker is set to false but the current transaction (the marker itself) is NOT skipped — it falls through to be emitted. In pagination, the marker is the last transaction that was already returned in the previous page. The correct behavior is to skip the marker transaction and start returning results from the next one. This would cause the last transaction of the previous page to be duplicated as the first transaction of the next page.