MC-41810: Cannot add bundle product with more than 1 checkbox option to the cart via Graphql

Author: tsviklinskyi

app/code/Magento/Bundle/Model/Product/Type.php

@@ -732,7 +732,11 @@ protected function _prepareProduct(\Magento\Framework\DataObject $buyRequest, $p
             if ((is_array($selections) && count($selections) > 0) || !$isStrictProcessMode) {
                 $uniqueKey = [$product->getId()];
                 $selectionIds = [];
-                $qtys = $buyRequest->getBundleOptionQty();
+                if ($buyRequest->getBundleOptionsData()) {
+                    $qtys = $buyRequest->getBundleOptionsData();
+                } else {
+                    $qtys = $buyRequest->getBundleOptionQty();
+                }
 
                 // Shuffle selection array by option position
                 usort($selections, [$this, 'shakeSelections']);

app/code/Magento/QuoteBundleOptions/Model/Cart/BuyRequest/BundleDataProvider.php

@@ -38,8 +38,9 @@ public function execute(CartItem $cartItem): array
 
             [$optionType, $optionId, $optionValueId, $optionQuantity] = $optionData;
             if ($optionType == self::OPTION_TYPE) {
-                $bundleOptionsData['bundle_option'][$optionId][$optionValueId] = $optionValueId;
-                $bundleOptionsData['bundle_option_qty'][$optionId][$optionValueId] = $optionQuantity;
+                $bundleOptionsData['bundle_option'][$optionId] = $optionValueId;
+                $bundleOptionsData['bundle_option_qty'][$optionId] = $optionQuantity;
+                $bundleOptionsData['bundle_options_data'][$optionId][$optionValueId] = $optionQuantity;
             }
         }
         //for bundle options with custom quantity
@@ -55,8 +56,9 @@ public function execute(CartItem $cartItem): array
             [$optionType, $optionId, $optionValueId] = $optionData;
             if ($optionType == self::OPTION_TYPE) {
                 $optionQuantity = $option->getValue();
-                $bundleOptionsData['bundle_option'][$optionId][$optionValueId] = $optionValueId;
-                $bundleOptionsData['bundle_option_qty'][$optionId][$optionValueId] = $optionQuantity;
+                $bundleOptionsData['bundle_option'][$optionId] = $optionValueId;
+                $bundleOptionsData['bundle_option_qty'][$optionId] = $optionQuantity;
+                $bundleOptionsData['bundle_options_data'][$optionId][$optionValueId] = $optionQuantity;
             }
         }