[tw5] Text Reference for set parameter in button

[Mohammad]

In https://tiddlywiki.com/#ButtonWidget it explains

set A TextReference <https://tiddlywiki.com/#TextReference> to which a new 
value will be assigned
Now assume you have a button like this

      <$button 
        set={{!!note-status}}
        setTo="show" 
        class="tc-btn-invisible">
          {{icon/addNote.svg}}
      </$button>

It creates a new tiddler with title got from the {{!!note-status}} and set 
its text to show. But the purpose here to set the field note-status in the 
current tiddler! However the below code works fine

      <$button 
        set="!!note-status"
        setTo="show" 
        class="tc-btn-invisible">
          {{icon/addNote.svg}}
      </$button>

Note to set="!!note-status"

Do you know why?

- Mohammad

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