TypeError: Cannot read properties of null (reading 'nodeType') (Astro + Svelte 5)

[AdrianButler]

Astro Info

Astro                    v4.14.5
Node                     v22.6.0
System                   Windows (x64)
Package Manager          unknown
Output                   static
Adapter                  none
Integrations             @astrojs/sitemap
                         @astrojs/tailwind
                         @astrojs/svelte
                         @playform/compress
                         astro-compressor

If this issue only occurs in one browser, which browser is a problem?

No response

Describe the Bug

I am getting this error and my svelte component will not load at all. It works perfectly fine in dev environment but when I build or run preview it stops working and the error is thrown in the console.

faq/:1 [astro-island] Error hydrating /astro/FaqQuestion.B9nkJrIu.js TypeError: Cannot read properties of null (reading 'nodeType')
at Ut (template.BZob6Wd.js:1:8993)
at G (FaqQuestion.B9nkJrIu.js:1:1234)
at render.Eek01tEQ.js:1:1270
at Sn (template.BZob6Wd_.js:1:5360)
at U (template.BZob6Wd_.js:1:6097)
at k (template.BZob6Wd_.js:1:2186)
at bt (template.BZob6Wd_.js:1:2805)
at render.Eek01tEQ.js:1:1212
at Sn (template.BZob6Wd_.js:1:5360)
at U (template.BZob6Wd_.js:1:6097)

What's the expected result?

The component loads correctly with no errors

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-1mfzqq?file=astro.config.mjs

Participation

• I am willing to submit a pull request for this issue.