Lookup in both cache if not skipObjectFunctionPropertyAugment

Author: sheetalkamat

src/compiler/checker.ts

@@ -10997,13 +10997,14 @@ namespace ts {
         // these partial properties when identifying discriminant properties, but otherwise they are filtered out
         // and do not appear to be present in the union type.
         function getUnionOrIntersectionProperty(type: UnionOrIntersectionType, name: __String, skipObjectFunctionPropertyAugment?: boolean): Symbol | undefined {
-            const properties = skipObjectFunctionPropertyAugment ?
-                type.propertyCacheWithoutObjectFunctionPropertyAugment ||= createSymbolTable() :
-                type.propertyCache ||= createSymbolTable();
-            let property = properties.get(name);
+            let property = type.propertyCacheWithoutObjectFunctionPropertyAugment?.get(name) ||
+                !skipObjectFunctionPropertyAugment ? type.propertyCache?.get(name) : undefined;
             if (!property) {
                 property = createUnionOrIntersectionProperty(type, name, skipObjectFunctionPropertyAugment);
                 if (property) {
+                    const properties = skipObjectFunctionPropertyAugment ?
+                        type.propertyCacheWithoutObjectFunctionPropertyAugment ||= createSymbolTable() :
+                        type.propertyCache ||= createSymbolTable();
                     properties.set(name, property);
                 }
             }