Each blocks with spread attributes on children not updating

[Rich-Harris]

REPL. I think what's happening here is that it doesn't believe the first each block to be dynamic; it doesn't recognise that there's a dynamic attribute, so it doesn't bother writing update code. This variant works as expected, because it trips the necessary wire.

[ghost]

Neither this trigger any wire when you change order of element in the array.
svelte v1.60.3

{{#each tabs as tabID, index }}
  <Tab :tabID :index on:tabReorderStart="hTabReorderStart(event)" on:tabReorderEnd="hTabReorderEnd(event)" /> 
{{/each}}

tabs is a computed property, and tabID is a String not an Object.

computed: {
    tabs: win => { 
        console.log(win.tabs) //this logs data change, no UI change
        return win.tabs
    }
}