Svelte 5: Interop bug with `$effect` and $ugar syntax of `writable` stores ... or nah?

[svelte-kit-so-good]

Describe the bug

The $ugar store syntax throws an infinite loop bug, whereas the universal syntax continues working. Given that stores will be around for at least Svelte 5, I wonder if this should be considered a bug?

	$effect(() => {
		/* 👌 bueno */
		test_store.update(store => {
			return {...store, id:counter}
		})

		/* 🪲 no bueno */
		// $test_store.id = counter
	})

Present since alpha 18 (discord chat); and re-surfaced in discord chat with Leftium in regards to SuperForms library

Reproduction

REPL

Logs

No response

System Info

Svelte v5.0.0-next.53

but present since alpha 18

Severity

annoyance