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.

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
    }
}