svelte:element custom element not updating when setting property to null/undefined

[ffossum]

Describe the bug

When using svelte:element with a custom element, setting a property to a null or undefined does not work. The setter on the custom element is simply not called. This is in contrast to the behavior when rendering the custom element directly using its registered tag name. In that case the element is updated as expected and the setter is called with null.

The REPL example shows the same custom element rendered twice. Once using svelte:element and once using its tag.
Clicking the button will rotate a name property between a string, null and undefined.

I would expect both of these to render the same, but the svelte:element version does not update whenever the value becomes null or undefined. As you can see in the console, its setter is never called.

Reproduction

https://svelte.dev/repl/e38d35f309f64c19b4f1028fe43a0be1?version=3.49.0

Logs

No response

System Info

Svelte 3.49

Severity

annoyance

[Conduitry]

This should be fixed now in 3.51.0 - https://svelte.dev/repl/e38d35f309f64c19b4f1028fe43a0be1?version=3.51.0

[ffossum]

Awesome! 👍