fix: update maindb txIndex after merge slotDB

otherwise there can be issue that txIndex is load before the change in
mergeSlotDB.

core/state/statedb.go

@@ -2627,8 +2627,6 @@ func (s *StateDB) AddrPrefetch(slotDb *ParallelStateDB) {
 // merged back to the main StateDB.
 func (s *StateDB) MergeSlotDB(slotDb *ParallelStateDB, slotReceipt *types.Receipt, txIndex int, fees *DelayedGasFee) *StateDB {
 
-	s.SetTxContext(slotDb.thash, slotDb.txIndex)
-
 	for s.nextRevisionId < slotDb.nextRevisionId {
 		if len(slotDb.validRevisions) > 0 {
 			r := slotDb.validRevisions[s.nextRevisionId]
@@ -2830,7 +2828,7 @@ func (s *StateDB) MergeSlotDB(slotDb *ParallelStateDB, slotReceipt *types.Receip
 			s.snapParallelLock.Unlock()
 		}
 	}
-
+	s.SetTxContext(slotDb.thash, slotDb.txIndex)
 	return s
 }