diff --git a/src/Umbraco.Web/PropertyEditors/ValueConverters/LegacyRelatedLinksEditorValueConvertor.cs b/src/Umbraco.Web/PropertyEditors/ValueConverters/LegacyRelatedLinksEditorValueConvertor.cs
index 28a20cfd00..4944fd0c6c 100644
--- a/src/Umbraco.Web/PropertyEditors/ValueConverters/LegacyRelatedLinksEditorValueConvertor.cs
+++ b/src/Umbraco.Web/PropertyEditors/ValueConverters/LegacyRelatedLinksEditorValueConvertor.cs
@@ -15,9 +15,9 @@ using Umbraco.Core.PropertyEditors.ValueConverters;
 
 namespace Umbraco.Web.PropertyEditors.ValueConverters
 {
-    [PropertyValueType(typeof(JArray))]
-    [PropertyValueCache(PropertyCacheValue.All, PropertyCacheLevel.Content)]
     [DefaultPropertyValueConverter(typeof(JsonValueConverter))] //this shadows the JsonValueConverter
+    [PropertyValueType(typeof(JArray))]
+    [PropertyValueCache(PropertyCacheValue.All, PropertyCacheLevel.Content)]    
     public class LegacyRelatedLinksEditorValueConvertor : PropertyValueConverterBase
     {
         public override bool IsConverter(PublishedPropertyType propertyType)
diff --git a/src/Umbraco.Web/PropertyEditors/ValueConverters/MultiNodeTreePickerPropertyConverter.cs b/src/Umbraco.Web/PropertyEditors/ValueConverters/MultiNodeTreePickerPropertyConverter.cs
index 431efda8f4..e24d4cbf4a 100644
--- a/src/Umbraco.Web/PropertyEditors/ValueConverters/MultiNodeTreePickerPropertyConverter.cs
+++ b/src/Umbraco.Web/PropertyEditors/ValueConverters/MultiNodeTreePickerPropertyConverter.cs
@@ -16,6 +16,7 @@ using Umbraco.Core.Configuration;
 using Umbraco.Core.Models;
 using Umbraco.Core.Models.PublishedContent;
 using Umbraco.Core.PropertyEditors;
+using Umbraco.Core.PropertyEditors.ValueConverters;
 
 namespace Umbraco.Web.PropertyEditors.ValueConverters
 {
@@ -23,7 +24,7 @@ namespace Umbraco.Web.PropertyEditors.ValueConverters
     /// <summary>
     /// The multi node tree picker property editor value converter.
     /// </summary>
-    [DefaultPropertyValueConverter]
+    [DefaultPropertyValueConverter(typeof(MustBeStringValueConverter))]
     [PropertyValueType(typeof(IEnumerable<IPublishedContent>))]
     [PropertyValueCache(PropertyCacheValue.Object, PropertyCacheLevel.ContentCache)]
     [PropertyValueCache(PropertyCacheValue.Source, PropertyCacheLevel.Content)]
diff --git a/src/Umbraco.Web/PropertyEditors/ValueConverters/MultipleMediaPickerPropertyConverter.cs b/src/Umbraco.Web/PropertyEditors/ValueConverters/MultipleMediaPickerPropertyConverter.cs
index 3b759fc9ff..72d746d779 100644
--- a/src/Umbraco.Web/PropertyEditors/ValueConverters/MultipleMediaPickerPropertyConverter.cs
+++ b/src/Umbraco.Web/PropertyEditors/ValueConverters/MultipleMediaPickerPropertyConverter.cs
@@ -17,6 +17,7 @@ using Umbraco.Core.Logging;
 using Umbraco.Core.Models;
 using Umbraco.Core.Models.PublishedContent;
 using Umbraco.Core.PropertyEditors;
+using Umbraco.Core.PropertyEditors.ValueConverters;
 using Umbraco.Core.Services;
 
 namespace Umbraco.Web.PropertyEditors.ValueConverters
@@ -24,7 +25,7 @@ namespace Umbraco.Web.PropertyEditors.ValueConverters
     /// <summary>
     /// The multiple media picker property value converter.
     /// </summary>
-    [DefaultPropertyValueConverter]
+    [DefaultPropertyValueConverter(typeof(MustBeStringValueConverter))]
     public class MultipleMediaPickerPropertyConverter : PropertyValueConverterBase, IPropertyValueConverterMeta
     {
         private readonly IDataTypeService _dataTypeService;
diff --git a/src/Umbraco.Web/PropertyEditors/ValueConverters/RelatedLinksEditorValueConvertor.cs b/src/Umbraco.Web/PropertyEditors/ValueConverters/RelatedLinksEditorValueConvertor.cs
index ec46889fae..4a611dc7be 100644
--- a/src/Umbraco.Web/PropertyEditors/ValueConverters/RelatedLinksEditorValueConvertor.cs
+++ b/src/Umbraco.Web/PropertyEditors/ValueConverters/RelatedLinksEditorValueConvertor.cs
@@ -15,6 +15,7 @@ using Umbraco.Core.Configuration;
 using Umbraco.Core.Logging;
 using Umbraco.Core.Models.PublishedContent;
 using Umbraco.Core.PropertyEditors;
+using Umbraco.Core.PropertyEditors.ValueConverters;
 using Umbraco.Web.Models;
 using Umbraco.Web.Routing;
 
@@ -23,7 +24,7 @@ namespace Umbraco.Web.PropertyEditors.ValueConverters
     /// <summary>
     /// The related links property value converter.
     /// </summary>
-    [DefaultPropertyValueConverter]
+    [DefaultPropertyValueConverter(typeof(LegacyRelatedLinksEditorValueConvertor), typeof(JsonValueConverter))]
     [PropertyValueType(typeof(RelatedLinks))]
     [PropertyValueCache(PropertyCacheValue.All, PropertyCacheLevel.ContentCache)]
     public class RelatedLinksPropertyConverter : PropertyValueConverterBase