next : Error when disabled is set on AlertDialog.Portal and dialog is open on load

[SteelAlloy]

Describe the bug

I tried to render the Dialog component in an open state (on load) while disabling the Portal.

My original intention was to make a progressive navigation that would work even without javascript, that said I don't know if it's feasible.

<AlertDialog.Root open={true}>
	<AlertDialog.Portal disabled>
		<AlertDialog.Overlay/>
		<AlertDialog.Content
			<!-- ... -->
		</AlertDialog.Content>
	</AlertDialog.Portal>
</AlertDialog.Root>

Reproduction

https://stackblitz.com/edit/github-mcd4pjzy?file=src%2Froutes%2F%2Bpage.svelte

Logs

TypeError: Cannot read properties of undefined (reading 'map')
    at useBodyScrollLock (/node_modules/.pnpm/bits-ui@1.0.0-next.80_svelte@5.19.4/node_modules/bits-ui/dist/internal/use-body-scroll-lock.svelte.js:85:16)
    at Scroll_lock (/node_modules/.pnpm/bits-ui@1.0.0-next.80_svelte@5.19.4/node_modules/bits-ui/dist/bits/utilities/scroll-lock/scroll-lock.svelte:7:19)
    at children (/node_modules/.pnpm/bits-ui@1.0.0-next.80_svelte@5.19.4/node_modules/bits-ui/dist/bits/alert-dialog/components/alert-dialog-content.svelte:98:49)
    at Text_selection_layer (/node_modules/.pnpm/bits-ui@1.0.0-next.80_svelte@5.19.4/node_modules/bits-ui/dist/bits/utilities/text-selection-layer/text-selection-layer.svelte:25:18)
    at children (/node_modules/.pnpm/bits-ui@1.0.0-next.80_svelte@5.19.4/node_modules/bits-ui/dist/bits/alert-dialog/components/alert-dialog-content.svelte:72:45)
    at Dismissible_layer (/node_modules/.pnpm/bits-ui@1.0.0-next.80_svelte@5.19.4/node_modules/bits-ui/dist/bits/utilities/dismissible-layer/dismissible-layer.svelte:27:18)
    at children (/node_modules/.pnpm/bits-ui@1.0.0-next.80_svelte@5.19.4/node_modules/bits-ui/dist/bits/alert-dialog/components/alert-dialog-content.svelte:61:42)
    at Escape_layer (/node_modules/.pnpm/bits-ui@1.0.0-next.80_svelte@5.19.4/node_modules/bits-ui/dist/bits/utilities/escape-layer/escape-layer.svelte:21:18)
    at focusScope (/node_modules/.pnpm/bits-ui@1.0.0-next.80_svelte@5.19.4/node_modules/bits-ui/dist/bits/alert-dialog/components/alert-dialog-content.svelte:51:39)
    at Focus_scope (/node_modules/.pnpm/bits-ui@1.0.0-next.80_svelte@5.19.4/node_modules/bits-ui/dist/bits/utilities/focus-scope/focus

System Info

System:
    OS: Linux 5.15 Ubuntu 24.04.1 LTS 24.04.1 LTS (Noble Numbat)
    CPU: (32) x64 13th Gen Intel(R) Core(TM) i9-13900F
    Memory: 25.53 GB / 31.25 GB
    Container: Yes
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.7.0 - ~/.nvm/versions/node/v22.7.0/bin/node
    npm: 10.8.2 - ~/.nvm/versions/node/v22.7.0/bin/npm
    pnpm: 9.15.4 - ~/.nvm/versions/node/v22.7.0/bin/pnpm
  npmPackages:
    @sveltejs/kit: ^2.16.0 => 2.16.1 
    bits-ui: 1.0.0-next.80 => 1.0.0-next.80 
    svelte: ^5.19.4 => 5.19.4

Severity

blocking an upgrade