Please find a link (via Dropbox) to a world where, with the latest beta (as of this writing), there is a pair of small chests. Lift the right chest (it has less stuff in it), put it back down to merge into a double chest (and replace its contents), and then exit the world.
Re-enter, and it will be a pair of single chests again.
https://www.dropbox.com/s/81xmvui5j4pw0jt/Patience.mcworld?dl=0
Thank you for your report!
We're tracking this issue in MCPE-146983, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki