We are creating a new non-visual block (i.e. no view) which will solely be referenced in other blocks as a property and would like to globally remove it from the list of available blocks when creating a new block in content areas. I know the AllowedTypes attribute can be used for this on a content area by content area basis, but I am hoping to find a way to apply it to all content areas without manually decorating each individual one in our entire codebase.
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