diff --git a/src/Serializers/QueryResultSerializer.php b/src/Serializers/QueryResultSerializer.php
index 8aa57cecf7..ecba7d30cd 100644
--- a/src/Serializers/QueryResultSerializer.php
+++ b/src/Serializers/QueryResultSerializer.php
@@ -101,7 +101,17 @@ public static function getSerialization( DataItem $dataItem, $printRequest = nul
 						];
 
 						foreach ( $recordValue->getDataItem()->getSemanticData()->getPropertyValues( $property ) as $value ) {
-							$recordDiValues[$label]['item'][] = self::getSerialization( $value );
+
+							if ( $property->findPropertyTypeID() === '_qty' ) {
+								$dataValue = DataValueFactory::getInstance()->newDataValueByItem( $value, $property );
+
+								$recordDiValues[$label]['item'][] = [
+									'value' => $dataValue->getNumber(),
+									'unit' => $dataValue->getUnit()
+								];
+							} else {
+								$recordDiValues[$label]['item'][] = self::getSerialization( $value );
+							}
 						}
 					}
 					$result = $recordDiValues;
@@ -130,6 +140,11 @@ public static function getSerialization( DataItem $dataItem, $printRequest = nul
 				// (unit is part of the datavalue object)
 				if ( $printRequest !== null && $printRequest->getTypeID() === '_qty' ) {
 					$diProperty = $printRequest->getData()->getDataItem();
+
+					if ( $printRequest->isMode( \SMW\Query\PrintRequest::PRINT_CHAIN ) ) {
+						$diProperty = $printRequest->getData()->getLastPropertyChainValue()->getDataItem();
+					}
+
 					$dataValue = DataValueFactory::getInstance()->newDataValueByItem( $dataItem, $diProperty );
 
 					$result = [
@@ -259,8 +274,12 @@ private static function serialize_printrequest( $printRequest ) {
 			return $serialized;
 		}
 
+		$serialized['redi'] = '';
+
 		// To match forwarded redirects
-		$serialized['redi'] = !$data->getInceptiveProperty()->equals( $data->getDataItem() ) ? $data->getInceptiveProperty()->getKey() : '';
+		if ( !$data->getInceptiveProperty()->equals( $data->getDataItem() ) ) {
+			$serialized['redi'] = $data->getInceptiveProperty()->getKey();
+		}
 
 		// To match internal properties like _MDAT
 		$serialized['key'] = $data->getDataItem()->getKey();
diff --git a/tests/phpunit/Integration/JSONScript/TestCases/s-0032.json b/tests/phpunit/Integration/JSONScript/TestCases/s-0032.json
new file mode 100644
index 0000000000..dd2f11adf2
--- /dev/null
+++ b/tests/phpunit/Integration/JSONScript/TestCases/s-0032.json
@@ -0,0 +1,65 @@
+{
+	"description": "Test `format=json` output via `Special:Ask` for `_ref_rec`/`_qty` type (#3517)",
+	"setup": [
+		{
+			"namespace": "SMW_NS_PROPERTY",
+			"page": "Ref prop",
+			"contents": "[[Has type::Reference]] [[Has fields::Field prop;other prop]]"
+		},
+		{
+			"namespace": "SMW_NS_PROPERTY",
+			"page": "Field prop",
+			"contents": "[[Has type::Quantity]] [[Corresponds to::1 km]]"
+		},
+		{
+			"namespace": "NS_MAIN",
+			"page": "S0032/1",
+			"contents": "[[Ref prop::123;S0032/2]] [[Category:S0032]]"
+		}
+	],
+	"tests": [
+		{
+			"type": "special",
+			"about": "#0",
+			"special-page": {
+				"page": "Ask",
+				"request-parameters": {
+					"p": {
+						"link": "none",
+						"limit": "10",
+						"offset": "0",
+						"mainlabel": "",
+						"prettyprint": false,
+						"unescape": true,
+						"format": "json"
+					},
+					"q": "[[Category:S0032]]",
+					"po": "?Ref prop.Field prop"
+				}
+			},
+			"assert-output": {
+				"to-contain": [
+					"\"chain\":\"Ref prop.Field prop\"",
+					"{\"Field prop\":[{\"value\":123,\"unit\":\"km\"}]}"
+				]
+			}
+		}
+	],
+	"settings": {
+		"wgContLang": "en",
+		"wgLang": "en",
+		"wgLanguageCode": "en",
+		"smwgPageSpecialProperties": [
+			"_MDAT"
+		],
+		"smwgNamespacesWithSemanticLinks": {
+			"NS_MAIN": true,
+			"SMW_NS_PROPERTY": true
+		}
+	},
+	"meta": {
+		"version": "2",
+		"is-incomplete": false,
+		"debug": false
+	}
+}