2.5.2
https://jsfiddle.net/pb32s2p3/6/
Open console (ctrl+shift+i in chrome, for example).
Output in console:
<div></div>
<div></div>
Output in console:
<div></div>
undefined
If remove 'v-once' or change vue version to 2.4.4 (in 2.5.1 and 2.5.0 bug remains) problem disappears.
Thanks.
Seems like this have been fixed by https://github.com/vuejs/vue/pull/6837
@javoski That's true! I checked with the last version and it's fixed