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This was fixed in EPiServer.Cms.Addons.Blocks 2.3.1, which requires an upgrade to at least CMS 10.10.4.
There isnt much difference between the "On-Page editing" view and the "All properties" view for the Self-Optimizing block, but it will at least avoid showing a 404 error.
We have installed version 2.3.0 of EPiServer.Cms.AddOns.Blocks the latest version compatible with CMS 10.9.1.0 but when trying to use in the On-Page Editing view is throwing the following error.
I've seen one other pots about a similar issue but no replies