Slot prop not update when transition finished

[zack9433]

Describe the bug
If a transition happens on an element that contains a slot which has a prop, the slot prop does not properly update if it is rendered again immediately after the transition ends.

To Reproduce
https://svelte.dev/repl/773209884de04140b5e07e1cff49fbc4?version=3.38.2

Expected behavior
It will update slot prop correctly when finish transition.

Information about your Svelte project:

Chrome v91
macOS 10.15.7
Svelte v3.18.2
See REPL

Additional context

There is a similar issue #3542 and #6042 seems to fix this issue but I guess #6042 don't trigger to update slot prop.

[karolwydmuch]

Did you try like this?

function blink() {
transitioning = true;

setTimeout(() => {
	test = 'bar1';
	transitioning = false;
}, 500); // if timeout value > duration time and slot prop `test` value will be 'bar'. 
}

[zack9433]

@kaisermann Yes, it is my solution currently. It is a workaround and doesn't solve the root cause.

[kaisermann]

I think you meant to mention @karolwydmuch 😆

[Conduitry]

This is fixed now in 3.38.3 - https://svelte.dev/repl/773209884de04140b5e07e1cff49fbc4?version=3.38.3