The guide Extensions has never mentioned MutatorIcon. Thus, when users want to write a block like 'text_join' or 'list_create_with', they might find their block missing the left-most gear icon through ...

Blocks must be defined as JSON files in the "/primitives" folder. The name of each primitive will be the name of the JSON file. For example, in "object_detected.json" the name of the primitive will be ...