Svelte 5: Reactivity bug in REPL

[JVariance]

Describe the bug

This bug appears only in the REPL. It works locally.

<script>
	let objArray = $state([{a: 1, b:2}, {a: 3, b:4}]);
</script>

<button onclick={() => {objArray = [{a: 8, b:2}, {a: 12, b:4}]}}>
	change
</button>
{#each objArray as c}
	<p>{c.a} - {c.b}</p>
	<input bind:value={c.a}/>
{/each}

• If I change the input value, the state is updated
• If I press the change button and afterwards change the input value, the state is also updated
• BUT If I press the button multiple times and then change the input value, the state is NOT updated anymore

Reproduction

https://svelte-5-preview.vercel.app/#H4sIAAAAAAAACk3OwWrDMBAE0F9Ztj0k4MYk7aGosiHfEecgy5tGqSIJaxUIQv9e5BaS4wzDYzKejKWI4pDRqSuhwH0I2CDfQw3xRpYJG4w-zbo2MurZBO4HN7AlBj9e9vOs7tDBa2TFtDpkJWDbwCh2pYEa3mv4KMf11-Bk-wCcHBOzd-Cdtkb_dHm1hq6H_IQu2ueztt39c6UsL_RZuW-q8p_WDy6_kNLnxzcVQZe6laHPeqMKvEHWm7HINiyGNC4khtG4SdyUTdQts7ZabbUKNnj1kzkZmlDwnKgcyy8nbhi7PgEAAA==

Logs

No response

System Info

Svelte v5.0.0-next.27

Severity

annoyance

[JVariance]

https://svelte-5-preview.vercel.app/#H4sIAAAAAAAACoXQ0W6DIBQG4Fc5YbvQxNXW7WJhaNLnqLtAPK1sFokcmjSEd5-4JfVuV-Qn8PEfAjvrER3jp8CMvCLj7GgtKxjdbQruhiPhkt3kZ5V2hFOzttS0pqURCabu6zjP8g41PDuShNkpSA6HAjpexQJSeE3hLX7mH60R5QMwovNEk4HJqFGr7zpkOdQNhA26au9b7VD9cTGuLdQgzQWT_Ks1_7s7692QrdX2-6RBVcV88WTfb5jwhFINjxGlAxXTk8I2Qe1khBdY1i6K0q5VhDbWE3Ta9PwmR4_1eqxMVpmsdNss33mden3W2DNOs8dllB8JCAKLiQEAAA==

I added a button that adds a new object on click. This object will be reactive. The others stay unreactive.

[navorite]

Here is a simple reproduction.

This regression happened due to #10053, (the state gets updated, but the <p> effect doesn't). It happens only when doing:

<p>{x.a} - {x.b}</p>

but not when doing:

<p>{x.a}</p>

After debugging, it seems related to consumers in the signal being removed incorrectly.