Index: vendor/magento/module-catalog-import-export/Model/Import/Product.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/vendor/magento/module-catalog-import-export/Model/Import/Product.php b/vendor/magento/module-catalog-import-export/Model/Import/Product.php
--- a/vendor/magento/module-catalog-import-export/Model/Import/Product.php	
+++ b/vendor/magento/module-catalog-import-export/Model/Import/Product.php	(date 1729687095186)
@@ -899,7 +899,7 @@
         $this->stockProcessor = $stockProcessor ?: ObjectManager::getInstance()
             ->get(StockProcessor::class);
         $this->linkProcessor = $linkProcessor ?? ObjectManager::getInstance()
-                ->get(LinkProcessor::class);
+            ->get(LinkProcessor::class);
         $this->linkProcessor->addNameToIds($this->_linkNameToId);
 
         parent::__construct(
@@ -921,7 +921,7 @@
         $this->validator->init($this);
         $this->dateTimeFactory = $dateTimeFactory ?? ObjectManager::getInstance()->get(DateTimeFactory::class);
         $this->productRepository = $productRepository ?? ObjectManager::getInstance()
-                ->get(ProductRepositoryInterface::class);
+            ->get(ProductRepositoryInterface::class);
     }
 
     /**
@@ -1576,6 +1576,10 @@
         $productsQty = null;
         $entityLinkField = $this->getProductEntityLinkField();
 
+        $writer = new \Zend_Log_Writer_Stream(BP . '/var/log/import-debug.log');
+        $logger = new \Zend_Log();
+        $logger->addWriter($writer);
+
         while ($bunch = $this->_dataSourceModel->getNextBunch()) {
             $entityRowsIn = [];
             $entityRowsUp = [];
@@ -1593,7 +1597,17 @@
             $existingImages = $this->getExistingImages($bunch);
             $this->addImageHashes($existingImages);
 
+            $oldSku = '';
             foreach ($bunch as $rowNum => $rowData) {
+                if (!$oldSku) {
+                    $logger->info('Processing: ' . $rowData[self::COL_SKU]);
+                    $oldSku = $rowData[self::COL_SKU];
+                } else {
+                    if ($oldSku != $rowData[self::COL_SKU]) {
+                        $logger->info('Processing: ' . $rowData[self::COL_SKU]);
+                        $oldSku = $rowData[self::COL_SKU];
+                    }
+                }
                 // reset category processor's failed categories array
                 $this->categoryProcessor->clearFailedCategories();
 
@@ -1959,6 +1973,8 @@
                 'catalog_product_import_bunch_save_after',
                 ['adapter' => $this, 'bunch' => $bunch]
             );
+
+            $logger->info('Bunch done');
         }
 
         return $this;