Setting a value at start

I want to run a script like this to update the display of another widget (tempo) at start.
Unfortunately it won't run, as it has no 'value' to begin with (though I set a default value). Can you advise the best way to approach this?

it has no 'value' to begin with (though I set a default value).

It's a bug then, until it's fixed you should be able to make it work by wrapping your code in a

setTimeout(()=>{
  // code
})

Fixed in upcoming release.