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Showing content from https://github.com/vuejs/vue/issues/5881 below:

key attribute set by `v-bind="obj"` is ignored by transition-group · Issue #5881 · vuejs/vue · GitHub

2.3.4

https://codepen.io/Nirazul/pen/RgGRjm

1. Click on the trigger button
2. There is only one list visible instead of two

According to the documentation I was expecting that I can use the v-bind object notation to set the key attribute.

The list is not rendered when the key attribute is not directly present on the element.

I'm aware that key is a special attribute and that there may be some sort of "hen and egg" problem at work when rendering items in a transition-group.
If the behaviour is intentional, there's maybe some space for improvement in the documentation.

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