Version

3.2.26

Reproduction link

github.com

Steps to reproduce

1. Clone repo
2. run 'npm i'
3. run 'npm run serve' --- you will see v-if in the console
4. then run 'npm run serve:prod' -- you will see undefined in the console

What is expected?

I expect in prod mode the same result as dev mode

What is actually happening?

I get different values of children. I need the same result because I try to analyze all slots in my components

This is because the program is optimized in prod mode，the HelloWorld component is compiled into:

const _sfc_main$1 = {
  setup(__props) {
    return (_ctx, _cache) => {
      return openBlock(), createBlock(_sfc_main$2, { opt2: "4321" }, {
        default: withCtx(() => [
          createCommentVNode("", true)
        ]),
        _: 1
      });
    };
  }
}

So,this.$slots.default()[0].children is undefined

In dev mode, the HelloWorld component is compiled into:

function _sfc_render(_ctx, _cache, $props, $setup, $data, $options) {
  return (_openBlock(), _createBlock($setup["Comp1"], { opt2: "4321" }, {
    default: _withCtx(() => [
      false
        ? (_openBlock(), _createBlock($setup["Comp2"], { key: 0 }))
        : _createCommentVNode("v-if", true)
    ]),
    _: 1 /* STABLE */
  }))
}