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Try changing PropertyListBase to PropertyList, we used to have to do the JSON serialization ourselves but if you have a base class that's doing it I think it can cause issues now.
id="EPiServer.CMS" version="11.15.0"
id="EPiServer.CMS.UI" version="11.25.0"
Currently have the following simple block set up:
So basically a block has a couple of properties one which is a PropertyList, I have used an editor descriptor and don't think I need a backing type as its not a custom object etc.
When I add something to the List, whether its the simple 2 string props or 1 string 1 Url props I get the same following error: