Unity 2021.3.2f1, Localization 1.0.5
Please see bug-report IN-2664. Every time you expand a LocalizationString in the Inspector, Unity outputs multiple errors:
Retrieving array element that was out of bounds
UnityEditor.Localization.UI.LocalizedStringPropertyDrawer/<>c__DisplayClass3_0:<CreatePropertyData>b__1 (int)
UnityEditorInternal.ReorderableList:CacheIfNeeded ()
UnityEditorInternal.ReorderableList:smile:oListElements (UnityEngine.Rect,UnityEngine.Rect)
UnityEditorInternal.ReorderableList:smile:oList (UnityEngine.Rect,UnityEngine.Rect)
UnityEditorInternal.ReorderableList:smile:oList (UnityEngine.Rect)
UnityEditor.PropertyHandler:OnGUI (UnityEngine.Rect,UnityEditor.SerializedProperty,UnityEngine.GUIContent,bool)
UnityEditorInternal.ReorderableList/Defaults:smile:rawElement (UnityEngine.Rect,UnityEditor.SerializedProperty,object,bool,bool,bool,bool)
UnityEditorInternal.ReorderableList:smile:oListElements (UnityEngine.Rect,UnityEngine.Rect)
UnityEditorInternal.ReorderableList:smile:oList (UnityEngine.Rect,UnityEngine.Rect)
UnityEditorInternal.ReorderableListWrapper:smile:rawChildren (UnityEngine.Rect,UnityEngine.Rect,UnityEngine.Rect,UnityEngine.Rect,UnityEngine.EventType)
UnityEditorInternal.ReorderableListWrapper:smile:raw (UnityEngine.GUIContent,UnityEngine.Rect,UnityEngine.Rect,string,bool)
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)
NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Localization.UI.LocalizedStringPropertyDrawer.GetArgumentElementHeight (UnityEditor.Localization.UI.ReorderableListExtended list, System.Int32 idx) (at Library/PackageCache/com.unity.localization@1.0.5/Editor/UI/Localized Reference/LocalizedStringPropertyDrawer.cs:201)
UnityEditor.Localization.UI.LocalizedStringPropertyDrawer+<>c__DisplayClass3_0.<CreatePropertyData>b__1 (System.Int32 i) (at Library/PackageCache/com.unity.localization@1.0.5/Editor/UI/Localized Reference/LocalizedStringPropertyDrawer.cs:149)
UnityEditorInternal.ReorderableList.CacheIfNeeded () (at <a017e354f3154926a5617fbac3a64fcc>:0)
UnityEditorInternal.ReorderableList.DoListElements (UnityEngine.Rect listRect, UnityEngine.Rect visibleRect) (at <a017e354f3154926a5617fbac3a64fcc>:0)
UnityEditorInternal.ReorderableList.DoList (UnityEngine.Rect rect, UnityEngine.Rect visibleRect) (at <a017e354f3154926a5617fbac3a64fcc>:0)
UnityEditorInternal.ReorderableList.DoList (UnityEngine.Rect rect) (at <a017e354f3154926a5617fbac3a64fcc>:0)
UnityEditor.Localization.UI.LocalizedStringPropertyDrawer.OnGUI (UnityEditor.Localization.UI.LocalizedReferencePropertyDrawer`1+Data[TCollection] data, UnityEngine.Rect position, UnityEditor.SerializedProperty property, UnityEngine.GUIContent label) (at Library/PackageCache/com.unity.localization@1.0.5/Editor/UI/Localized Reference/LocalizedStringPropertyDrawer.cs:216)
UnityEditor.Localization.UI.PropertyDrawerExtended`1[TData].OnGUI (UnityEngine.Rect position, UnityEditor.SerializedProperty property, UnityEngine.GUIContent label) (at Library/PackageCache/com.unity.localization@1.0.5/Editor/UI/Utility/PropertyDrawerExtended.cs:52)
UnityEditor.PropertyDrawer.OnGUISafe (UnityEngine.Rect position, UnityEditor.SerializedProperty property, UnityEngine.GUIContent label) (at <a017e354f3154926a5617fbac3a64fcc>:0)
UnityEditor.PropertyHandler.OnGUI (UnityEngine.Rect position, UnityEditor.SerializedProperty property, UnityEngine.GUIContent label, System.Boolean includeChildren, UnityEngine.Rect visibleArea) (at <a017e354f3154926a5617fbac3a64fcc>:0)
UnityEditor.PropertyHandler.OnGUI (UnityEngine.Rect position, UnityEditor.SerializedProperty property, UnityEngine.GUIContent label, System.Boolean includeChildren) (at <a017e354f3154926a5617fbac3a64fcc>:0)
UnityEditorInternal.ReorderableList+Defaults.DrawElement (UnityEngine.Rect rect, UnityEditor.SerializedProperty element, System.Object listItem, System.Boolean selected, System.Boolean focused, System.Boolean draggable, System.Boolean editable) (at <a017e354f3154926a5617fbac3a64fcc>:0)
UnityEditorInternal.ReorderableList.DoListElements (UnityEngine.Rect listRect, UnityEngine.Rect visibleRect) (at <a017e354f3154926a5617fbac3a64fcc>:0)
UnityEditorInternal.ReorderableList.DoList (UnityEngine.Rect rect, UnityEngine.Rect visibleRect) (at <a017e354f3154926a5617fbac3a64fcc>:0)
UnityEditorInternal.ReorderableListWrapper.DrawChildren (UnityEngine.Rect listRect, UnityEngine.Rect headerRect, UnityEngine.Rect sizeRect, UnityEngine.Rect visibleRect, UnityEngine.EventType previousEvent) (at <a017e354f3154926a5617fbac3a64fcc>:0)
UnityEditorInternal.ReorderableListWrapper.Draw (UnityEngine.GUIContent label, UnityEngine.Rect r, UnityEngine.Rect visibleArea, System.String tooltip, System.Boolean includeChildren) (at <a017e354f3154926a5617fbac3a64fcc>:0)
UnityEditor.PropertyHandler.OnGUI (UnityEngine.Rect position, UnityEditor.SerializedProperty property, UnityEngine.GUIContent label, System.Boolean includeChildren, UnityEngine.Rect visibleArea) (at <a017e354f3154926a5617fbac3a64fcc>:0)
UnityEditor.GenericInspector.OnOptimizedInspectorGUI (UnityEngine.Rect contentRect) (at <a017e354f3154926a5617fbac3a64fcc>:0)
UnityEditor.UIElements.InspectorElement+<>c__DisplayClass59_0.<CreateIMGUIInspectorFromEditor>b__0 () (at <5cf6bb2c14f1476f9cd6b153e70ca8b2>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)
