diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
index 3596d580c9..bd2fc31cb5 100644
--- a/.git-blame-ignore-revs
+++ b/.git-blame-ignore-revs
@@ -24,3 +24,4 @@ c4e2bf407aa0b7a3d34605134791013ba8a2d376
 062fb57831db2e3e25afc1bd63cf8b09d46ffa67
 13fa17ad575aadf0ef823d63d86fbbdd4a37cd9b
 f00f4fe6ed5e22cdd2e3f68370c2da96e6bbc8e7
+899ed51a7b6607161fcda5c1000115a076cc4fe7
diff --git a/commercetools/commercetools-sdk-java-api/src/main/java/com/commercetools/api/models/category/CategoryTreeFactory.java b/commercetools/commercetools-sdk-java-api/src/main/java/com/commercetools/api/models/category/CategoryTreeFactory.java
index d108a53c5f..87e82807c2 100644
--- a/commercetools/commercetools-sdk-java-api/src/main/java/com/commercetools/api/models/category/CategoryTreeFactory.java
+++ b/commercetools/commercetools-sdk-java-api/src/main/java/com/commercetools/api/models/category/CategoryTreeFactory.java
@@ -64,7 +64,7 @@ private Map<LocalizedStringEntry, Category> getLocalizedStringEntryCategoryMap(
                     .values()
                     .keySet()
                     .stream()
-                    .map(Locale::new)
+                    .map(Locale::forLanguageTag)
                     .collect(Collectors.toSet());
             localesForTheCategory.forEach(locale -> {
                 final LocalizedStringEntry stringsEntry = LocalizedStringEntry.of(locale,
diff --git a/commercetools/commercetools-sdk-java-api/src/test/java/com/commercetools/CategoriesTest.java b/commercetools/commercetools-sdk-java-api/src/test/java/com/commercetools/CategoriesTest.java
index 94ba8a978a..bf22e62fcc 100644
--- a/commercetools/commercetools-sdk-java-api/src/test/java/com/commercetools/CategoriesTest.java
+++ b/commercetools/commercetools-sdk-java-api/src/test/java/com/commercetools/CategoriesTest.java
@@ -66,4 +66,63 @@ public void testCategoryTree() {
         var result = tree.findBySlug(Locale.ENGLISH, "women");
         Assertions.assertThat(result).isNotEmpty();
     }
+
+    @Test
+    public void testGetLocalizedStringEntryCategoryMap() {
+        List<Category> allCategoriesAsFlatList = List.of(
+            Category.builder()
+                    .name(LocalizedString.of(Locale.forLanguageTag("en-US"), "Women"))
+                    .slug(LocalizedString.of(Locale.forLanguageTag("en-US"), "women"))
+                    .id("1")
+                    .version(1L)
+                    .createdAt(ZonedDateTime.now())
+                    .lastModifiedAt(ZonedDateTime.now())
+                    .ancestors()
+                    .orderHint("c2")
+                    .build(),
+            Category.builder()
+                    .name(LocalizedString.of(Locale.forLanguageTag("en"), "Men"))
+                    .slug(LocalizedString.of(Locale.forLanguageTag("en"), "men"))
+                    .id("2")
+                    .version(1L)
+                    .createdAt(ZonedDateTime.now())
+                    .lastModifiedAt(ZonedDateTime.now())
+                    .ancestors()
+                    .orderHint("c2")
+                    .build(),
+            Category.builder()
+                    .name(LocalizedString.of(Locale.forLanguageTag("en-us"), "Kids"))
+                    .slug(LocalizedString.of(Locale.forLanguageTag("en-us"), "kids"))
+                    .id("3")
+                    .version(1L)
+                    .createdAt(ZonedDateTime.now())
+                    .lastModifiedAt(ZonedDateTime.now())
+                    .ancestors()
+                    .orderHint("c2")
+                    .build());
+        CategoryTreeFactory factory = CategoryTreeFactory.of();
+
+        var tree = factory.create(allCategoriesAsFlatList);
+        var result = tree.findBySlug(Locale.forLanguageTag("en-US"), "women");
+        Assertions.assertThat(result).isNotEmpty();
+        var enUsResult = tree.findBySlug(Locale.forLanguageTag("en-us"), "women");
+        Assertions.assertThat(enUsResult).isNotEmpty();
+
+        var enResult = tree.findBySlug(Locale.forLanguageTag("en"), "women");
+        Assertions.assertThat(enResult).isEmpty();
+
+        var menResult = tree.findBySlug(Locale.forLanguageTag("en-US"), "men");
+        Assertions.assertThat(menResult).isEmpty();
+        var menEnUsResult = tree.findBySlug(Locale.forLanguageTag("en-us"), "men");
+        Assertions.assertThat(menEnUsResult).isEmpty();
+        var menEnResult = tree.findBySlug(Locale.forLanguageTag("en"), "men");
+        Assertions.assertThat(menEnResult).isNotEmpty();
+
+        var kidsResult = tree.findBySlug(Locale.forLanguageTag("en-US"), "kids");
+        Assertions.assertThat(kidsResult).isNotEmpty();
+        var kidsEnUsResult = tree.findBySlug(Locale.forLanguageTag("en-us"), "kids");
+        Assertions.assertThat(kidsEnUsResult).isNotEmpty();
+        var kidsEnResult = tree.findBySlug(Locale.forLanguageTag("en"), "kids");
+        Assertions.assertThat(kidsEnResult).isEmpty();
+    }
 }