May not be a bug, more so a minor oversight.
On my first play through and I built pretty close to a "set piece" with an unburied Decrepit Chest and a skeleton on the beach. I'm now attempting to expand the house I have built nearby, but the chest seems to block building. Unlike a lot of the normal shipwrecks, the chest and skeleton are indestructible; they can't be destroyed with tools nor destroyed using the deconstruct tool. It's not a major issue, but I'll likely end up relocating my entire base because of this, which is a bit bothersome given I'm currently playing solo.
Hopefully, we can get the option to remove these after the chest has been fully looted. Thank you for reviewing.