Multiple `await someFunction()` in a derived results in `unsafe_state_mutation` error

[kevmodrome]

Describe the bug

When you have two awaits in a $derived you will get a unssafe_state_mutation error even though no state is being updated:

let postsAndComments = $derived({
	posts: await posts(),
	comments: await comments()
})

Reproduction

https://www.sveltelab.dev/ds3d9yw8emutk33

Logs

Uncaught (in promise) Svelte error: state_unsafe_mutation
	Updating state inside `$derived(...)`, `$inspect(...)` or a template expression is forbidden. If the value should not be reactive, declare it without `$state`
	https://svelte.dev/e/state_unsafe_mutation

System Info

System:
    OS: macOS 26.1
    CPU: (16) arm64 Apple M4 Max
    Memory: 42.27 GB / 128.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.12.0 - /Users/kevin/.volta/tools/image/node/22.12.0/bin/node
    npm: 10.9.0 - /Users/kevin/.volta/tools/image/node/22.12.0/bin/npm
    pnpm: 10.4.1 - /Users/kevin/.volta/bin/pnpm
    bun: 1.3.4 - /Users/kevin/.bun/bin/bun
    Deno: 2.5.6 - /opt/homebrew/bin/deno
  Browsers:
    Chrome: 143.0.7499.41
    Safari: 26.1
    Safari Technology Preview: 26.0
  npmPackages:
    svelte: ^5.46.0 => 5.46.0

Severity

annoyance