Mod Version: r2.1-245

Reproduction: 1 or more Glass Bottle, 1 Bottled Cloud. Place the cloud and then lift it up with a glass bottle that is located to the left of the other(s) bottle(s).
https://www.dropbox.com/s/6o9ro5bjtdhxf0e/%5BQuark%5D%20Dupe%20Cloud.mp4

Here's what I got from one Cloud: