When I use /clone to clone in a region containing Beds facing all directions, the ones facing south drop as Items. Four screenshots are attached of what I find in the different directions. I cannot seem to replicate this issue using Beds and /clone, it only works in my exact setup for some reason. It might involve chunk borders or something, but nevertheless not all of the Beds clone in error-free.

I expected all of the Beds to be cloned in.

Instead, the ones facing south did not get cloned in. They dropped as Items.

I've tried to replicate this, but it seems I can't for whatever reason. Attached are screenshots of what I find in all four directions after I clone it in. The Beds facing south are dropped as Items. This really breaks my randomized dungeon map!