Three.js doesn't start rendering automatically on Plunker

[8Observer8]

I got a random example from the topic:

@prisoner849

Hi!
Your octahedrons are out of the scope of the function of the rendering loop.
https://jsfiddle.net/prisoner849/Lz3kbowg/

Copied it to Plunker: Plunker - Three.js Topic. Mouse wheel rotate geometry Preview works nice. Maybe this problem is related to Fetch API (that I use to load models from Collada by loadAsync) on Plunker, but I am not sure. I will try to use callbacks instead of loadAsync.