Repository: svelte
Issue: Svelte 5 SSR: Rendering correctly in CSR only but failing in SSR
Labels: awaiting submitter

### Describe the bug

Svelte 5 app using SvelteKit renders correctly with only CSR but fails if SSR is enabled

https://github.com/sveltejs/svelte/assets/55116576/e1a330ca-77c7-4499-baca-ff4c2dc39273

The errors reported in SSR seem to break things completely (unable to submit the input)

### Reproduction

Not a minimal reproduction: https://github.com/nmathew98/qwery/tree/702eed80b749a82c8373cd33246ef7c2821c1151/packages/example-svelte

In the video there is a console log just after `ssrData` which is not present in the reproduction

Data loader is here: https://github.com/nmathew98/qwery/blob/702eed80b749a82c8373cd33246ef7c2821c1151/packages/example-svelte/src/routes/%2Bpage.server.ts

And used in the component here:
- https://github.com/nmathew98/qwery/blob/702eed80b749a82c8373cd33246ef7c2821c1151/packages/example-svelte/src/routes/%2Bpage.svelte#L14
- https://github.com/nmathew98/qwery/blob/702eed80b749a82c8373cd33246ef7c2821c1151/packages/example-svelte/src/components/App.svelte#L13

### Logs

```shell
[Error] ERR_SVELTE_HYDRATION_MISMATCH: Hydration failed because the initial UI does not match what was rendered on the server.
TypeError: null is not an object (evaluating 'node.nodeType')
hydrate_anchor — hydration.js:33
(anonymous function) — mode-watcher.svelte:37
execute_reaction_fn — runtime.js:230
execute_effect — runtime.js:393
create_effect — effects.js:67
head — svelte-head.js:32
Mode_watcher — mode-watcher.svelte:29:86
App — App.svelte:46
_page — +page.svelte:4
(anonymous function) — root.svelte:45
validate_dynamic_component — validate.js:30
(anonymous function) — root.svelte:45
execute_reaction_fn — runtime.js:230
execute_effect — runtime.js:393
create_effect — effects.js:67
(anonymous function) — svelte-component.js:29
execute_reaction_fn — runtime.js:230
execute_effect — runtime.js:393
create_effect — effects.js:67
component — svelte-component.js:20
(anonymous function) — root.svelte:44
slot — render.js:72
Layout — layout.svelte:17
(anonymous function) — root.svelte:44
validate_dynamic_component — validate.js:30
(anonymous function) — root.svelte:44
execute_reaction_fn — runtime.js:230
execute_effect — runtime.js:393
create_effect — effects.js:67
(anonymous function) — svelte-component.js:29
execute_reaction_fn — runtime.js:230
execute_effect — runtime.js:393
create_effect — effects.js:67
component — svelte-component.js:20
(anonymous function) — root.svelte:43
execute_reaction_fn — runtime.js:230
execute_effect — runtime.js:393
create_effect — effects.js:67
(anonymous function) — if.js:59
execute_reaction_fn — runtime.js:230
execute_effect — runtime.js:393
create_effect — effects.js:67
if_block — if.js:30
Root — root.svelte:39
(anonymous function) — render.js:251
untrack — runtime.js:809
(anonymous function) — render.js:237
execute_reaction_fn — runtime.js:230
execute_effect — runtime.js:393
create_effect — effects.js:67
(anonymous function) — render.js:236
untrack — runtime.js:809
execute_reaction_fn — runtime.js:230
execute_effect — runtime.js:393
create_effect — effects.js:67
effect_root — effects.js:141
_mount — render.js:235
(anonymous function) — render.js:136
flush_sync — runtime.js:619
hydrate — render.js:132
Svelte4Component — legacy-client.js:74
(anonymous function) — legacy-client.js:46
initialize — client.js:434
(anonymous function) — client.js:2386
	hydrate (chunk-FMCHLLZG.js:1959)
	Svelte4Component (chunk-FMCHLLZG.js:2115)
	(anonymous function) (chunk-FMCHLLZG.js:2092)
	initialize (client.js:434)
	(anonymous function) (client.js:2386)

[Error] TypeError: Result from 'getOwnPropertyDescriptor' fails the IsCompatiblePropertyDescriptor test
	entries (@b__s_incremental.js:73)
	each (@b__s_incremental.js:73)
	freeze (@b__s_incremental.js:157)
	maybeFreeze (@b__s_incremental.js:320)
	finalize (@b__s_incremental.js:264)
	finalizeProperty (@b__s_incremental.js:300)
	forEach
	each (@b__s_incremental.js:77)
	finalize (@b__s_incremental.js:278)
	processResult (@b__s_incremental.js:240)
	dispatch (@b__s_incremental.js:706)
	apply (svelte-qwery.js:153)
	(anonymous function)
	apply (svelte-qwery.js:682)
	(anonymous function)
	onSubmitNewThread (NewThread.svelte:38)
	bubble_event (chunk-XBIXG6K4.js:2044)
	(anonymous function) (textarea.svelte:63)
```


### System Info

```shell
System:
    OS: macOS 14.4
    CPU: (8) x64 Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz
    Memory: 18.55 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.0.0 - ~/.nvm/versions/node/v20.0.0/bin/node
    Yarn: 1.22.19 - ~/.nvm/versions/node/v20.0.0/bin/yarn
    npm: 9.6.4 - ~/.nvm/versions/node/v20.0.0/bin/npm
    pnpm: 8.15.4 - ~/.nvm/versions/node/v20.0.0/bin/pnpm
    bun: 1.0.36 - /usr/local/bin/bun
  Browsers:
    Safari: 17.4
  npmPackages:
    svelte: 5.0.0-next.89 => 5.0.0-next.89
```


### Severity

blocking all usage of svelte