This fixes an issue when trying to convert external menu items using the property value converter.
This contains a patch to replace the core JsonUdiConverter with a custom implementation due to a bug.
A PR for the core has been raised here ( Fixes exception when converting Udi's in a propertyvalueconverter by AaronSadlerUK · Pull Request #20011 · umbraco/Umbraco-CMS · GitHub ) and this patch will be reverted once / if it’s merged.