Hydration mismatch when rendering snippets with async values

[henrykrinkle01]

Describe the bug

When a snippet renders an async value with ssr enabled, there's a warning about hydration mismatch. It still renders correctly however. Not sure if there's any consequence or just a false positive.

Reproduction

<script lang="ts">
	const count = await 1;
</script>

{#snippet foo(count: number)}
	{count}
{/snippet}
{@render foo(count)}

https://stackblitz.com/edit/async-snippet-hydration-problem?file=src%2Froutes%2F%2Bpage.svelte

Logs

+layout.svelte:34 [svelte] hydration_mismatchHydration failed because the initial UI does not match what was rendered on the server

System Info

svelte@5.43.14
kit@2.49.0

Severity

annoyance

[henrykrinkle01]

Edit: added stackblitz repl.
This problem is actually more annoying than just a false positive. It causes flash and layout shift.