Fixed critical issue with scheduler with MetaOps

src/scheduler/Scheduler.cpp

@@ -643,7 +643,7 @@ Aidge::Elts_t Aidge::Scheduler::getNbAvailableData(const std::shared_ptr<Node>&
             if (input.first == node) {
                 // Current node is an input
                 const auto upperInput = upperNode->inputs()[nodeInputIdx];
-                if (upperInput.first) {
+                if (upperInput.first && nodeInputIdx == inputIdx) {
                     return upperInput.first->getOperator()->getNbProducedData(upperInput.second);
                 }
             }