Assignments inside event handler blocks inside loops don't trigger reactivity #3245
Description
https://svelte.dev/repl/263f78428b7e4bfd8151ddaaeb6f8bd1?version=3.6.7
If I make an assignment directly to an object property inside an event handler block inside a loop, the reactivity system doesn't update the page. If I assign to items[i].foo, reactivity does work.