[Bug] Unable to update story state through actions

[ACERposS]

Describe the bug

Following the examples in Interactions.stories and Example.stories it seems as though any updates to Story state should be reflected in the UI, regardless of whether the state is modified via a play callback or UI action.

Neither of these patterns seems to be working currently- the UI never updates. This makes it impossible to author interactive stories (although it is still possible to write interaction tests if the only validation is that callbacks are called as expected).

Environment

• version: 5.0.0-next.21
• Svelte version: 5.17.1
• Storybook version: 8.4.7
• @storybook/svelte version: 8.4.7
• OS: Windows 10 Enterprise
• Node.js version: 21.6.2
• NPM version: 10.4.0
• Browser (if applicable): Firefox
• Browser version (if applicable): 134

Additional context

Possibly related to #164

[xeho91]

Do you mind to please elaborate more on what you mean by "Story state should be reflected in the UI"?

I'm testing those examples in the latest PR:

1. Example.stories - https://6042cb92fd1bb200234586ee-xqrvztbabm.chromatic.com/?path=/story/examples-button--primary
2. Interaction.stories - https://6042cb92fd1bb200234586ee-xqrvztbabm.chromatic.com/?path=/story/tests-addons-interactions--default

and unless I misunderstood the issue, I don't see the problem.

[JReinhold]

This was a bug introduced in Svelte 5.17.0 and fixed in 5.17.3, it seems like you're running 5.17.1.

Updating your Svelte version will fix this.

https://github.com/sveltejs/svelte/releases/tag/svelte%405.17.3

Duplicate of storybookjs/storybook#30223