used v-for to render a component which including v-for for templates, if templates aren't wrapped by one root element, bug happen

[toxic-johann]

Vue.js version

2.0-rc8 / 2.0-rc7

Reproduction Link

https://codepen.io/toxic-johann/pen/JRJgGJ?editors=1111

Steps to reproduce

open console, and run test() function

What is Expected?

open console, and run success() function

you can see what happen on codepen
https://codepen.io/toxic-johann/pen/JRJgGJ?editors=1111

[posva]

Please make sure to read the Issue Reporting Guidelines before opening new issues. The issue list only accepts bug reports and feature requests. Questions should be posted to the Gitter chat room, forum or StackOverflow. Thanks.

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Your example is hard to follow with one letter variable names everywhere. Also, make sure the problem doesn't appear without Vuex before adding it to the example.
You said you tried using keys but they're not in the example.
I think that if you update your example and publish it on the forums, you'll be able to get some help 😉

[toxic-johann]

now i remove the vuex on the codepen, and add keys on v-for.And i change the single letter into a
Significant word.
i use data to set the data.And when i use splice on the data, it occurs.
so i think its a bug.May it help

[toxic-johann]

What more.After more testing.I found the actual problem is.In the template, i must have only one root element.Or that situation would happen. Even though i add two template but only one will be render, it still have some problem.I think, if vue consider multiple element int the template is forbidden.It should throw a warn.
Otherwise, it's a bug

here is the click with root element wrap http://codepen.io/toxic-johann/pen/wzqaJz?editors=1111-----every thing is normal
here is the click without root element https://codepen.io/toxic-johann/pen/JRJgGJ?editors=1111 ----sth happend

Vue.js version

2.0-rc8 / 2.0-rc7

Reproduction Link

https://codepen.io/toxic-johann/pen/JRJgGJ?editors=1111

Steps to reproduce

open console, and run test() function

What is Expected?

open console, and run success() function
or you can click https://codepen.io/toxic-johann/pen/JRJgGJ?editors=1111.
when i keep on one root element in v-for, the problem dispear.