Version

3.0.4

Reproduction link

https://jsfiddle.net/obqwxgp0/4/

Steps to reproduce

Based on the jsfiddle reproduction.

Click the show content button will get [Vue warn] on the console.

What is expected?

Should show the <slot /> content

What is actually happening?

[Vue warn]: Unhandled error during execution of scheduler flush. This is likely a Vue internals bug.

The jsfiddle reproduction has left a comment in js block. line 16.

This has been fixed in https://github.com/vuejs/vue-next/commit/c59897c7b0dbd82b5bbf3fbca945c0639ac37fb8