Version

3.2.4

Reproduction link

https://codesandbox.io/s/confident-jang-xl3zj?file=/src/components/VueButtonBox.vue

What is expected?

Get component instances in multi-level nested slots.

What is actually happening?

Iterate through multiple layers of slots to get the required components.

 <button-box>
     <button />
     <button />
     <button />
<button-box>

// just slots.default().forEach(button => ...)
// but like this: 

 <button-box>
  <box-wrapper>
     <button />
     <button />
     <button />
 </box-wrapper>
<button-box>

// how can l get the button component instance in the parent component?

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