[Component] [checkbox-group] [Bug] when use cdn import element-plus under v6.0, checkboxgroup can't work normally

[pyvadev]

Bug Type: Component

Environment

• Vue Version: 3.3.4
• Element Plus Version: 2.3.12
• Browser / OS: Chrome/124.0.0.0 Safari/537.36 / MacOS 14.4.1
• Build Tool: CDN

Reproduction

Related Component

• el-checkbox-group

Reproduction Link

Element Plus Playground

Steps to reproduce

Clike one of the checkbox.

What is Expected?

Checked a checkbox and ElCheckboxGroup @change handler work as expect, value will be the checked box value.

What is actually happening?

It checked all checkbox. The console output of the value of ElCheckboxGroup @change handler, list contain a undefined when checked, and is emtpy when unchecked.
If the 'v-model' variable of ElCheckboxGroup has default value, the output will be the default value and undefined when checked, be default value when unchecked.

Additional comments

This bug only occur when use cdn to import element-plus, when I dev in local use local npm package it will not occur.

This bug occur under the version v6.0, at least v2.0-v5.* all have this bug.

Although this bug not occur in v6.0+, but I notice the update notes do not mention this bug, don't know wheather occur in the future.

[makedopamine]

Could you provide a minimal reproduction with codesandbox or something? Since the bug only occurs in CDN version, playground can't reproduce the bug.

[pyvadev]

@makedopamine Can be reproduce with the Element Plus Playground I mentioned. This playground can't save the version information, so switch to the corresponding version.