Slots with dynamic component aren't working

[elbourki]

Describe the bug
This was working perfectly fine in the previous versions of svelte, it stopped working when I upgraded Svelte from 3.19.2 to 3.20.1.
I'm not sure what causes the issue but it happens if you have a slot wrapped in a div, and used <svelte:component/> as a fallback. Removing the div or replacing <svelte:component/> works just fine.

Logs
Uncaught (in promise): div is not defined

To Reproduce
https://svelte.dev/repl/41a85b6cd92f4e1fb4773b90eb5c97ca

Expected behavior
Show the other component

Stacktraces

Stack trace

Component.svelte:46 Uncaught (in promise) ReferenceError: div is not defined
at Object.update [as p] (Component.svelte:46)
at Object.update [as p] (Component.svelte:44)
at update (index.mjs:687)
at flush (index.mjs:656)

Information about your Svelte project:

• Your browser and the version: Chrome 80

• Your operating system: Windows 10

• Svelte version: 3.20.1

• Whether your project uses Webpack or Rollup; Webpack

Severity
Honestly, this blocks my usage of Svelte, I thought this component was finished but when it suddenly stopped working I had to dig in the changes I have made for a few hours before finding out it was an issue with Svelte itself. And the component is a pretty big deal in my project.

[Conduitry]

Fixed in 3.21.0 - https://svelte.dev/repl/41a85b6cd92f4e1fb4773b90eb5c97ca?version=3.21.0